My very first post on TB was in this type of thread.
These threads do come up often, but they're always a lot of fun. I like to see what others name their instruments.
I always give my instruments women's names. They also typically have some kind of meaning. Here are my main axes:
Carvin LB76W "Claribel". Named for her claro walnut top, and clear-as-a-bell tone.
Schecter Stiletto Studio 8 "Jezebel". A female friend suggested this name, and then laughed heartily, as if she'd made a good joke. I'm still not sure I get it.

But I like the name, and it stuck. For originals, she and Claribel both come to the gigs, and their names kind of go together: "Claribel and Jezebel".
Fender Precision "Bessie". I got this baby for blues and other roots music, and she's named for the great Bessie Smith. 'Nuff said. Yes, she has flats. No, she doesn't have a tort guard.

Sometimes I call her "Bessie da Thump Machine".