I've noticed in almost all of the comment sections on Welsh names "ei" is either pronounced "eye" or "ay" depending on where you live in Wales.
― Anonymous User 1/16/2022
5
Most people pronounce it like Ei-ra and sometimes ay-ruh.
― Anonymous User 12/20/2021
3
This is my daughter's name and we pronounce it 'Ay-ra'. Although people correctly say that you will hear it pronounced 'Ay-ra' or 'Eye-ra' in Wales, where we are from, it was important to us that we got it right by Welsh speakers, not being Welsh speakers ourselves. We asked a lot of friends, colleagues and acquaintances whose first language was Welsh and they all pronounced it 'Ay-ra'. Both pronunciations are lovely though in my opinion.
― Anonymous User 9/26/2016
11
My ex-neighbour Eira in Ceredigion, a Welsh-speaking area of coastal Wales, pronounces the first syllable to rhyme with EYE.
The name wouldn't be mistook for Era or Error because they are pronounced completely different. Where I live, we pronounce the word snow as "Ay-Ra", with "Ay" as in "Bay".