diff --git a/doc/developer-notes.md b/doc/developer-notes.md
--- a/doc/developer-notes.md
+++ b/doc/developer-notes.md
@@ -508,6 +508,12 @@
 
   - *Rationale*: Shorter and simpler header files are easier to read, and reduce compile time
 
+- Use only the lowercase alphanumerics (`a-z0-9`), underscore (`_`) and hyphen (`-`) in source code filenames.
+
+  - *Rationale*: `grep`:ing and auto-completing filenames is easier when using a consistent
+    naming pattern. Potential problems when building on case-insensitive filesystems are
+    avoided when using only lowercase characters in source code filenames.
+
 - Don't import anything into the global namespace (`using namespace ...`). Use
   fully specified types such as `std::string`.
 
diff --git a/src/Makefile.bench.include b/src/Makefile.bench.include
--- a/src/Makefile.bench.include
+++ b/src/Makefile.bench.include
@@ -18,7 +18,7 @@
   bench/cashaddr.cpp \
   bench/checkblock.cpp \
   bench/checkqueue.cpp \
-  bench/Examples.cpp \
+  bench/examples.cpp \
   bench/rollingbloom.cpp \
   bench/crypto_aes.cpp \
   bench/crypto_hash.cpp \
diff --git a/src/Makefile.test.include b/src/Makefile.test.include
--- a/src/Makefile.test.include
+++ b/src/Makefile.test.include
@@ -62,7 +62,7 @@
   test/crypto_tests.cpp \
   test/cuckoocache_tests.cpp \
   test/dbwrapper_tests.cpp \
-  test/DoS_tests.cpp \
+  test/denialofservice_tests.cpp \
   test/dstencode_tests.cpp \
   test/excessiveblock_tests.cpp \
   test/feerate_tests.cpp \
@@ -99,7 +99,7 @@
   test/scheduler_tests.cpp \
   test/schnorr_tests.cpp \
   test/script_commitment_tests.cpp \
-  test/script_P2SH_tests.cpp \
+  test/script_p2sh_tests.cpp \
   test/script_standard_tests.cpp \
   test/script_tests.cpp \
   test/scriptflags.h \
diff --git a/src/bench/CMakeLists.txt b/src/bench/CMakeLists.txt
--- a/src/bench/CMakeLists.txt
+++ b/src/bench/CMakeLists.txt
@@ -45,7 +45,7 @@
 	checkqueue.cpp
 	crypto_aes.cpp
 	crypto_hash.cpp
-	Examples.cpp
+	examples.cpp
 	gcs_filter.cpp
 	lockedpool.cpp
 	mempool_eviction.cpp
diff --git a/src/bench/Examples.cpp b/src/bench/examples.cpp
rename from src/bench/Examples.cpp
rename to src/bench/examples.cpp
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -667,7 +667,7 @@
 } // namespace
 
 // This function is used for testing the stale tip eviction logic, see
-// DoS_tests.cpp
+// denialofservice_tests.cpp
 void UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds) {
     LOCK(cs_main);
     CNodeState *state = State(node);
diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -75,7 +75,7 @@
 	crypto_tests.cpp
 	cuckoocache_tests.cpp
 	dbwrapper_tests.cpp
-	DoS_tests.cpp
+	denialofservice_tests.cpp
 	dstencode_tests.cpp
 	excessiveblock_tests.cpp
 	feerate_tests.cpp
@@ -111,7 +111,7 @@
 	scheduler_tests.cpp
 	schnorr_tests.cpp
 	script_commitment_tests.cpp
-	script_P2SH_tests.cpp
+	script_p2sh_tests.cpp
 	script_standard_tests.cpp
 	script_tests.cpp
 	scriptflags.cpp
diff --git a/src/test/DoS_tests.cpp b/src/test/denialofservice_tests.cpp
rename from src/test/DoS_tests.cpp
rename to src/test/denialofservice_tests.cpp
--- a/src/test/DoS_tests.cpp
+++ b/src/test/denialofservice_tests.cpp
@@ -43,7 +43,7 @@
 
 void UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds);
 
-BOOST_FIXTURE_TEST_SUITE(DoS_tests, TestingSetup)
+BOOST_FIXTURE_TEST_SUITE(denialofservice_tests, TestingSetup)
 
 // Test eviction of an outbound peer whose chain never advances
 // Mock a node connection, and use mocktime to simulate a peer which never sends
diff --git a/src/test/script_P2SH_tests.cpp b/src/test/script_p2sh_tests.cpp
rename from src/test/script_P2SH_tests.cpp
rename to src/test/script_p2sh_tests.cpp
--- a/src/test/script_P2SH_tests.cpp
+++ b/src/test/script_p2sh_tests.cpp
@@ -47,7 +47,7 @@
         &err);
 }
 
-BOOST_FIXTURE_TEST_SUITE(script_P2SH_tests, BasicTestingSetup)
+BOOST_FIXTURE_TEST_SUITE(script_p2sh_tests, BasicTestingSetup)
 
 BOOST_AUTO_TEST_CASE(sign) {
     LOCK(cs_main);