Ewe, though it's spelled weird, does at least fit its context. When looking into specific gendered terms for species, someone could expect a few weird ones.

On a side note, I find it funny how the word ewe is banned from several places because all it's ever used for is to replace the "you" in things like an F-bomb. It's like an accidental/indirect swear word.

"Hey bro, what's a female sheep called?"

"Oh that's easy, it's ew--" ban hammer crashes down out of nowhere