it's become a sort of comic nickname in Wales these days.

When my sister-in-law was pregnant with their first child, my brother always referred to the unborn kiddie as Tallulah !

My brother-in-law used the name Hamish McTavish for my sister's first unborn - I was 7 at the time and was horrified! (at least they were in Scotland at the time, so there's some vaguely reasonable explanation lol)

Must be a man thing to nick name a fetus.