The spelling of Walsh in Irish?

There isn't one single definitive Irish spelling for "Walsh". The Irish equivalent depends on the specific origin and pronunciation of the surname. It could be:

* Breathnach: This is a common and widely accepted equivalent, particularly in the south and west of Ireland.

* Uallach: This is a less common alternative.

Therefore, depending on the family's history and region of origin, either Breathnach or Uallach might be used. It's best to research the family's history to determine the most accurate translation.