How many airlines still name their aircraft?
Prompted by something in another thread, I find myself wondering: How many of today's airlines still name their aircraft, as opposed to simply using registration numbers or whatever?
I know that at least some Virgin Atlantic aircraft have names as well as numbers, and I know that in the glory days of Pan Am the airline named many (all?) of its aircraft, but who else is doing it today? And what kinds of names are they giving to their aircraft?
An extension of this question is how many airlines choose their registration numbers for meaning, i.e., choosing G-HOST instead of G-18773T. Some registration numbers I see seem pretty obviously chosen for meaning, but I don't know how widespread the practice is.