I name them - or at least have since I've (kind of) grown up.
The first bike I named was Walter, a 1-year anniversary present from DH. He's a Raleigh, and, um, vintage enough that he's lugged. Really quite a nice bike, though he never fit me very well.
My other bike is William, the 'Bent. (After William Bent of Colorado history fame)
I've also named a bike I haven't even shopped for yet, but we're not going there.
All my bikes are male - I'm not the type to spend that much intimate time with females (no offense intended, that's just the way I was made) - and all have names that refer to a pioneer of some sort, have a logical connection to the bike itself, and start with 'W.' I'm not sure how this happened, but there it is. Elder Daughter thinks I'm done buying bikes, 'cause I surely have run out of names. (see above)
Come to think of it, my viola and string bass feel male to me, as have our cars, at least the cars I liked. Neither instruments or cars have been named, however, and I did spend quite a bit of one-on-one time with the instruments.
MomOnBike
(recovering musician)
Give big space to the festive dog that make sport in the roadway. Avoid entanglement with your wheel spoke.
(Sign in Japan)
1978 Raleigh Gran Prix
2003 EZ Sport AX