Hi Alex,
I am not aware of anything which will do what you ask; as the permutations are endless and highly system-specific.
On a d3 system, the source for these commands is available; which when I do a QUICK scan over all seems to use the same core routine which is ultimately move-file. Source code trial finishes at the internal command :move-file.
So: does the routine do anything other that what it states on the tin? No.
References to the filename could be anywhere on an entire system; as you have found. Possibly areas are INCLUDES, DICTIONARIES, source code, Q-pointers and on it goes.
Tools that MAY help include the SB+ one mentioned as well as d3's SEARCH-SYSTEM and FIND; but nothing I can think of would be a global one-size-fixes-all routine.
Sorry to be the bearer of bad news