Menyw, a variant of benyw, is cognate with English queen, Norwegian kvinne ("woman"), Ancient Greek γῠνή (gunḗ, whence English gynecologist), Russian жена́ (žená, "wife") and Sanskrit जनि (jáni, "woman, wife; birth; mother; birthplace").
That's a very good question. We might need to delete this sentence.
Although I could think of a not too rude context given that popular names like Ceri and Celyn are non gender specific so someone in androgynous clothes with a neutral voice or over the phone might elicit such an enquiry.