Once upon a time file names could only be a certain length. Was 7 characters for he name and 3 or the extension? 8 characters for the name? I can’t recall but somewhere along the way this limitation was lifted and we can name a file something useful. But I never developed the discipline to take advantage of this and have some old files with names like 4777959349_o.jpg . In my OCD moments this bugs me and I might take a few minutes (or a few days) and rename offending files.

I rarely see file names in iPhoto (I refuse to call it Apple Photos), just the Title I enter when adding photo. But my buddy George Kopp pointed out I can change the file name to the Title when exporting images for backup. This short screencast (4 min) shows this feature.