Same thing happens to me. I am sure this is a little bug that will be fixed.

I actually had this happen with one of my Companions, the Unicorn Duellist 'Ridolfo Capoferro'. Only, it occured after I promoted him. His name totally changed; he's now 'Giovan Trevisan'. It's very strange!

I had this issue as well. My pet went from Admiral Abbey to King Somethingorother after three battles. I did report it to KI, who got back to me, agreed it was some sort of bug and it wasn't just me, regretted the name change couldn't be reversed (although I suppose I could fritter away the gold to change it), and that was it. King Bosco doesn't fight any better or worse than Admiral Abbey did, but I do kind of wish the name hadn't changed in the first place.

Hopefully they'll figure out the cause and get it fixed. I'm a bit concerned to hear that it also affects crew members. That's not cool at all...

And it's still doing it. Or else my poor buccaneer is cursed. I claimed the Booshbeard bundle skarakeet for her earlier this week and it came out (coincidence?) as Admiral Abbey, just as my crawler did. But in the first fight she suddenly became Queen something (a promotion!). I wonder if Admiral and Abbey are the first terms on the two lists, and for whatever reason they get listed as the pet's name, then it gets what it should have become randomly, if that makes sense.