What Is It About Deirdre

Okay, what's going on with me and the name Deirdre? I wrote a YA with a protag named Deirdre. That was on purpose, so okay, that's fine. But I've just been re-reading my current work in progress--not the YA but an adult mystery this time--and I have named not one, but TWO minor characters Deirdre! One is the about-to-be-married daughter of a secretary in the police department...the other is a snooty sales clerk at Abigail's, an upscale dress shop.

I toyed briefly with seeing if the two Deirdres could be one and the same, perhaps unleashing some interesting possibilities, but I don't think it's going to work. Alice's daughter is NOT snooty, and I need the sales clerk to be so she can intimidate my protag Gigi.

But seriously, what is with me? Any suggestions for alternate names is appreciated.