diff --git a/openmp/libomptarget/DeviceRTL/include/Configuration.h b/openmp/libomptarget/DeviceRTL/include/Configuration.h
--- a/openmp/libomptarget/DeviceRTL/include/Configuration.h
+++ b/openmp/libomptarget/DeviceRTL/include/Configuration.h
@@ -15,7 +15,7 @@
 
 #include "Types.h"
 
-namespace _OMP {
+namespace ompx {
 namespace config {
 
 enum DebugKind : uint32_t {
@@ -49,6 +49,6 @@
 bool mayUseNestedParallelism();
 
 } // namespace config
-} // namespace _OMP
+} // namespace ompx
 
 #endif
diff --git a/openmp/libomptarget/DeviceRTL/include/Mapping.h b/openmp/libomptarget/DeviceRTL/include/Mapping.h
--- a/openmp/libomptarget/DeviceRTL/include/Mapping.h
+++ b/openmp/libomptarget/DeviceRTL/include/Mapping.h
@@ -14,7 +14,7 @@
 
 #include "Types.h"
 
-namespace _OMP {
+namespace ompx {
 
 namespace mapping {
 
@@ -97,6 +97,6 @@
 
 } // namespace mapping
 
-} // namespace _OMP
+} // namespace ompx
 
 #endif
diff --git a/openmp/libomptarget/DeviceRTL/include/State.h b/openmp/libomptarget/DeviceRTL/include/State.h
--- a/openmp/libomptarget/DeviceRTL/include/State.h
+++ b/openmp/libomptarget/DeviceRTL/include/State.h
@@ -19,7 +19,7 @@
 
 #pragma omp begin declare target device_type(nohost)
 
-namespace _OMP {
+namespace ompx {
 
 namespace memory {
 
@@ -364,7 +364,7 @@
 
 } // namespace icv
 
-} // namespace _OMP
+} // namespace ompx
 
 #pragma omp end declare target
 
diff --git a/openmp/libomptarget/DeviceRTL/include/Synchronization.h b/openmp/libomptarget/DeviceRTL/include/Synchronization.h
--- a/openmp/libomptarget/DeviceRTL/include/Synchronization.h
+++ b/openmp/libomptarget/DeviceRTL/include/Synchronization.h
@@ -14,7 +14,7 @@
 
 #include "Types.h"
 
-namespace _OMP {
+namespace ompx {
 
 namespace synchronize {
 
@@ -124,6 +124,6 @@
 
 } // namespace fence
 
-} // namespace _OMP
+} // namespace ompx
 
 #endif
diff --git a/openmp/libomptarget/DeviceRTL/include/Utils.h b/openmp/libomptarget/DeviceRTL/include/Utils.h
--- a/openmp/libomptarget/DeviceRTL/include/Utils.h
+++ b/openmp/libomptarget/DeviceRTL/include/Utils.h
@@ -16,7 +16,7 @@
 
 #pragma omp begin declare target device_type(nohost)
 
-namespace _OMP {
+namespace ompx {
 namespace utils {
 
 /// Return the value \p Var from thread Id \p SrcLane in the warp if the thread
@@ -89,7 +89,7 @@
 #define OMP_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
 
 } // namespace utils
-} // namespace _OMP
+} // namespace ompx
 
 #pragma omp end declare target
 
diff --git a/openmp/libomptarget/DeviceRTL/src/Configuration.cpp b/openmp/libomptarget/DeviceRTL/src/Configuration.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Configuration.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Configuration.cpp
@@ -16,7 +16,7 @@
 #include "State.h"
 #include "Types.h"
 
-using namespace _OMP;
+using namespace ompx;
 
 #pragma omp begin declare target device_type(nohost)
 
diff --git a/openmp/libomptarget/DeviceRTL/src/Debug.cpp b/openmp/libomptarget/DeviceRTL/src/Debug.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Debug.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Debug.cpp
@@ -16,7 +16,7 @@
 #include "Mapping.h"
 #include "Types.h"
 
-using namespace _OMP;
+using namespace ompx;
 
 #pragma omp begin declare target device_type(nohost)
 
diff --git a/openmp/libomptarget/DeviceRTL/src/Kernel.cpp b/openmp/libomptarget/DeviceRTL/src/Kernel.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Kernel.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Kernel.cpp
@@ -17,7 +17,7 @@
 #include "Synchronization.h"
 #include "Types.h"
 
-using namespace _OMP;
+using namespace ompx;
 
 #pragma omp begin declare target device_type(nohost)
 
diff --git a/openmp/libomptarget/DeviceRTL/src/Mapping.cpp b/openmp/libomptarget/DeviceRTL/src/Mapping.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Mapping.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Mapping.cpp
@@ -19,9 +19,9 @@
 
 #include "llvm/Frontend/OpenMP/OMPGridValues.h"
 
-using namespace _OMP;
+using namespace ompx;
 
-namespace _OMP {
+namespace ompx {
 namespace impl {
 
 // Forward declarations defined to be defined for AMDGCN and NVPTX.
@@ -154,7 +154,7 @@
 uint32_t getWarpSize() { return getGridValue().GV_Warp_Size; }
 
 } // namespace impl
-} // namespace _OMP
+} // namespace ompx
 
 /// We have to be deliberate about the distinction of `mapping::` and `impl::`
 /// below to avoid repeating assumptions or including irrelevant ones.
diff --git a/openmp/libomptarget/DeviceRTL/src/Misc.cpp b/openmp/libomptarget/DeviceRTL/src/Misc.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Misc.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Misc.cpp
@@ -15,7 +15,7 @@
 
 #pragma omp begin declare target device_type(nohost)
 
-namespace _OMP {
+namespace ompx {
 namespace impl {
 
 double getWTick();
@@ -59,7 +59,7 @@
 #pragma omp end declare variant
 
 } // namespace impl
-} // namespace _OMP
+} // namespace ompx
 
 /// Interfaces
 ///
@@ -76,9 +76,9 @@
   return 0;
 }
 
-double omp_get_wtick(void) { return _OMP::impl::getWTick(); }
+double omp_get_wtick(void) { return ompx::impl::getWTick(); }
 
-double omp_get_wtime(void) { return _OMP::impl::getWTime(); }
+double omp_get_wtime(void) { return ompx::impl::getWTime(); }
 }
 
 ///}
diff --git a/openmp/libomptarget/DeviceRTL/src/Parallelism.cpp b/openmp/libomptarget/DeviceRTL/src/Parallelism.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Parallelism.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Parallelism.cpp
@@ -40,7 +40,7 @@
 #include "Types.h"
 #include "Utils.h"
 
-using namespace _OMP;
+using namespace ompx;
 
 #pragma omp begin declare target device_type(nohost)
 
diff --git a/openmp/libomptarget/DeviceRTL/src/Reduction.cpp b/openmp/libomptarget/DeviceRTL/src/Reduction.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Reduction.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Reduction.cpp
@@ -18,7 +18,7 @@
 #include "Types.h"
 #include "Utils.h"
 
-using namespace _OMP;
+using namespace ompx;
 
 namespace {
 
diff --git a/openmp/libomptarget/DeviceRTL/src/State.cpp b/openmp/libomptarget/DeviceRTL/src/State.cpp
--- a/openmp/libomptarget/DeviceRTL/src/State.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/State.cpp
@@ -17,7 +17,7 @@
 #include "Types.h"
 #include "Utils.h"
 
-using namespace _OMP;
+using namespace ompx;
 
 #pragma omp begin declare target device_type(nohost)
 
@@ -221,8 +221,8 @@
   ASSERT(HasThreadState == Other.HasThreadState);
 }
 
-state::TeamStateTy SHARED(_OMP::state::TeamState);
-state::ThreadStateTy **SHARED(_OMP::state::ThreadStates);
+state::TeamStateTy SHARED(ompx::state::TeamState);
+state::ThreadStateTy **SHARED(ompx::state::ThreadStates);
 
 namespace {
 
diff --git a/openmp/libomptarget/DeviceRTL/src/Synchronization.cpp b/openmp/libomptarget/DeviceRTL/src/Synchronization.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Synchronization.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Synchronization.cpp
@@ -21,7 +21,7 @@
 
 #pragma omp begin declare target device_type(nohost)
 
-using namespace _OMP;
+using namespace ompx;
 
 namespace impl {
 
diff --git a/openmp/libomptarget/DeviceRTL/src/Tasking.cpp b/openmp/libomptarget/DeviceRTL/src/Tasking.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Tasking.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Tasking.cpp
@@ -18,7 +18,7 @@
 #include "Types.h"
 #include "Utils.h"
 
-using namespace _OMP;
+using namespace ompx;
 
 #pragma omp begin declare target device_type(nohost)
 
diff --git a/openmp/libomptarget/DeviceRTL/src/Utils.cpp b/openmp/libomptarget/DeviceRTL/src/Utils.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Utils.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Utils.cpp
@@ -17,7 +17,7 @@
 
 #pragma omp begin declare target device_type(nohost)
 
-using namespace _OMP;
+using namespace ompx;
 
 extern "C" __attribute__((weak)) int IsSPMDMode;
 
diff --git a/openmp/libomptarget/DeviceRTL/src/Workshare.cpp b/openmp/libomptarget/DeviceRTL/src/Workshare.cpp
--- a/openmp/libomptarget/DeviceRTL/src/Workshare.cpp
+++ b/openmp/libomptarget/DeviceRTL/src/Workshare.cpp
@@ -20,7 +20,7 @@
 #include "Types.h"
 #include "Utils.h"
 
-using namespace _OMP;
+using namespace ompx;
 
 // TODO:
 struct DynamicScheduleTracker {