Or 'Cock' and call your kid Half.
or as in the Lake District, 'Green' and they called their son Bright.
then, I've mentioned it before, my sisters' maths master with the surname 'Legg' and joking with the girls, 'a boy and it's Ivor or a girl, Iona or Eva'. My old man ran into him in the street with the pram....congratulated him and asked the sex. 'A girl' - 'So Iona or Eva?' Answer - 'Oh I was just messing around, we've called her Margaret'.
Quick as a flash, the old man responded with a derivative of Margaret - see if you can work it out?
Suffice to say, the Leggs hadn't thought of it. Poor kid.