I was actually thinking about starting this thread the other day after I opened my mouth in the MIM Club thread...but wasn't sure where to go with it.
I do, for the following reasons,
--It speaks of the personal relationship I have with each of them; each evoke certain feelings and inspiration with their tone. Gives them a little bit of extra "character". Plus, in the case of the one, the appearance was the inspiration for the name.
--It's a hell of a lot easier, when you're talking with people who know nothing about bass, but who know you HAVE basses, to identify each to them. To my co-workers and students, "Go get me my Fender Jazz Special in Sonic Blue" (never mind the upgrades) means nothing. I say, "Go get Jade for me," and the right bass will show up.
So, I've got a name (and gender) for each.
Chip (M)--'92-'93 MIM Precision, Lake Placid Blue w/white pickguard (want to swap it out for tort)
Has a rather unfortunate gigging history--got dropped on a stage 2 owners ago and sustained damage that prompted the name...

. But he still thumps with gusto!
Jade (F)--'84-'87 MIJ Jazz Special, Sonic Blue (GAWGEOUS color that always washes out in pics), upgraded pups and Black Beauties (while those aren't my fave to play, I can't imagine anything else on that bass!!!)
The name just...came to me. Based on the color, and since the black-on-teal-green looked so sexy, figured this one was a "she". The tones are just as moody as a woman, too.

Low, throaty purr (soloed P) to trash-talking (blended P and J) to whine (soloed J--will probably swap that one out 'cause the tone's just too thin).
Cherry (F)--'06 Squier Standard P-Bass, Metallic Red (?--is that what they call it?) w/white pickguard (want to swap that out too)--bought in England this summer 'cause I was desperate to have something to practice on and it was the cheapest I could get that wasn't totally store-damaged.
Why the name? Two-fold--her color, of course, and the fact that I was over there to chase Simply Red around on tour. But I didn't want anything cheesy relating to the band name or color. Since she's my youngest "kid", wanted something kind of juvenile. Cherry just seemed to work.
Will be rescuing her from her "foster mum" the next chance I get--I never hear from the woman. I know she's not going to do anything to the bass, but if I'm going to leave a $300 plank of wood and wires with you, I'd like a "hey, how ya doin'?" once in a while!!

Besides, I want to upgrade her/get her a proper TLC setup, and can't do that if she's not here.
Alright, someone else type up their confessions--including the person who started this thread.

Fun topic!
Will edit to add pics when I can get some decent ones.