The best replacement for filename is filename.

The best alternatives to filename are rated as following:
★★★★★  filename
★★★★  extension is too long
★★★  file name
★★  extension too long
★★  filepath
★  libname
★  path too long
★  request uri
  script_name

Your alternative for filename is not listed? Suggest!
Speaking about filename, one probably shouldn't forget about path.

Other search terms related to filename and their ratings are:
★★★★★ path
★★ path c#
You have in mind a companion for filename and it is not yet here? Propose!



Google Trends

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filename
filename
extension is too long