This guy, Whatley, worked for Chief O'Brien in The Assignment (S05E05).
Then Bashir Got Sleazy with this lady, Lt. Watley, in Trials and Tribblations (S05E06).
After which in Rapture (S05E10), Whatley is this guy because maybe his great grandmother hooked up with the wrong dude, because Julian Bashir is a dirty flirt, talking about his flap.
I see the difference in the spellings of her name from these two boys, but frankly I never heard it as different, so the spelling of her name is not canon, so you got to wonder how else the timeline changed after the team got back from Deep Space Station K-7?

Then Bashir Got Sleazy with this lady, Lt. Watley, in Trials and Tribblations (S05E06).

After which in Rapture (S05E10), Whatley is this guy because maybe his great grandmother hooked up with the wrong dude, because Julian Bashir is a dirty flirt, talking about his flap.

I see the difference in the spellings of her name from these two boys, but frankly I never heard it as different, so the spelling of her name is not canon, so you got to wonder how else the timeline changed after the team got back from Deep Space Station K-7?