Jaskier is fucking appalled by the animal-naming habits of every single witcher within three (3) days of arriving at Kaer Morhen
This is a man who named each individual mouse in his prison cell. And now he finds that it's not just Geralt, who keeps buying chestnut mares and naming them all Roach like some kind of imagination-deficient walking time loop.
It's Lambert, the absolute cretin, who always names his poor animal Horse, as though it needs a fucking reminder, because "it's a fucking horse, songbird, it doesn't need a fucking name".
It's Vesemir, who's spent at least Geralt's entire lifetime leaving his horses with whatever name they had when he bought them, even when it's entirely inappropriate for a witcher's mount. Geralt remembers learning to ride on Vesemir's big black gelding Samson, which is not terrible as horse names go, he supposes. But Samson was succeeded by Dame Bubbles III, who was named by her previous owner's eight-year-old daughter, and even Vesemir himself can't keep a straight face at the memory.
It's Coën, who's always named his horses after food, which seems terribly mean. Rump-Steak is actually very sweet, nipping habit aside.
And then Eskel comes home, right as Jaskier is comforting poor Rump-Steak ("Never mind, dear boy, my parents named me Julian and I turned out alright") and finally, here is a man with some sense. Lil Bleater is not the most creative of names, but Eskel picked it himself, and his horse has a suitably witchery intimidating name even if he's a sweet soft boy who gets bullied by Miss Roachie. Someone around here has a brain cell - thank heavens!
(This is a very wrong-footing introduction for Eskel. He's not used to having strange men drowning in Geralt's fluffiest fur-lined cloak stalk up to him before he's even got in the door, addressing him by name and demanding to know what he calls his horse. But he's delighted to be pronounced "the only one around here with some bloody sense", asks Geralt, "Is this your bard?" and promptly explodes laughing at the thought of Geralt getting henpecked every time he names a new Roach for twenty fucking years)