Mhamó. More Irish words for grandma. This term would not be used to directly address a grandparent. But how to pronounce them? Irish Translation. granny. Children would instead use Maimeó (MAM o) or Móraí (MO ree). Few people know that the Irish or Gaelic word for grandmother is seanmháthair ((shan a WAW her), literally meaning "old mother." Alternate spellings include seanmhair, seanmathair and sean mathair. móraí noun. Here's a list of translations. Read on for tips. Some of the Irish words for grandparents are Mamó, Móraí and Daideo (Grandma/Granny, Grandpa/Granddad/Grandad). máthair mhór noun.