diff --git a/doc/developer-notes.md b/doc/developer-notes.md
index f20d72b08a..90bad116f0 100644
--- a/doc/developer-notes.md
+++ b/doc/developer-notes.md
@@ -521,6 +521,12 @@ Source code organization
 
   - *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.
+
 - Every `.cpp` and `.h` file should `#include` every header file it directly uses classes, functions or other
   definitions from, even if those headers are already included indirectly through other headers. One exception
   is that a `.cpp` file does not need to re-include the includes already included in its corresponding `.h` file.
diff --git a/src/Makefile.bench.include b/src/Makefile.bench.include
index f722769792..ddf8f152cc 100644
--- a/src/Makefile.bench.include
+++ b/src/Makefile.bench.include
@@ -21,7 +21,7 @@ bench_bench_dash_SOURCES = \
   bench/checkblock.cpp \
   bench/checkqueue.cpp \
   bench/ecdsa.cpp \
-  bench/Examples.cpp \
+  bench/examples.cpp \
   bench/rollingbloom.cpp \
   bench/chacha20.cpp \
   bench/chacha_poly_aead.cpp \
diff --git a/src/Makefile.test.include b/src/Makefile.test.include
index ed06a153e0..6696ad1bf7 100644
--- a/src/Makefile.test.include
+++ b/src/Makefile.test.include
@@ -51,7 +51,7 @@ BITCOIN_TESTS =\
   test/compress_tests.cpp \
   test/crypto_tests.cpp \
   test/cuckoocache_tests.cpp \
-  test/DoS_tests.cpp \
+  test/denialofservice_tests.cpp \
   test/evo_deterministicmns_tests.cpp \
   test/evo_simplifiedmns_tests.cpp \
   test/getarg_tests.cpp \
@@ -80,7 +80,7 @@ BITCOIN_TESTS =\
   test/rpc_tests.cpp \
   test/sanity_tests.cpp \
   test/scheduler_tests.cpp \
-  test/script_P2SH_tests.cpp \
+  test/script_p2sh_tests.cpp \
   test/script_P2PK_tests.cpp \
   test/script_P2PKH_tests.cpp \
   test/script_tests.cpp \
diff --git a/src/bench/Examples.cpp b/src/bench/examples.cpp
similarity index 100%
rename from src/bench/Examples.cpp
rename to src/bench/examples.cpp
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 53b682a7a8..13f53213b5 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -836,7 +836,7 @@ size_t GetRequestedObjectCount(NodeId nodeId)
 }
 
 // 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);
diff --git a/src/test/DoS_tests.cpp b/src/test/denialofservice_tests.cpp
similarity index 99%
rename from src/test/DoS_tests.cpp
rename to src/test/denialofservice_tests.cpp
index 6481b5520a..aa8cbf448b 100644
--- a/src/test/DoS_tests.cpp
+++ b/src/test/denialofservice_tests.cpp
@@ -45,7 +45,7 @@ static NodeId id = 0;
 
 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
diff --git a/src/test/script_P2SH_tests.cpp b/src/test/script_p2sh_tests.cpp
similarity index 99%
rename from src/test/script_P2SH_tests.cpp
rename to src/test/script_p2sh_tests.cpp
index 1a368e1932..86069db0ff 100644
--- a/src/test/script_P2SH_tests.cpp
+++ b/src/test/script_p2sh_tests.cpp
@@ -46,7 +46,7 @@ Verify(const CScript& scriptSig, const CScript& scriptPubKey, bool fStrict, Scri
 }
 
 
-BOOST_FIXTURE_TEST_SUITE(script_P2SH_tests, BasicTestingSetup)
+BOOST_FIXTURE_TEST_SUITE(script_p2sh_tests, BasicTestingSetup)
 
 BOOST_AUTO_TEST_CASE(sign)
 {