Since you did not specify which Gaelic, here are two answers
Nollaig Chridheil is Scottish
Irish would be Nollaig faoi shéan agus faoi shonas duit!
Irish Gaelic: Breithlá shona dhuit. Scots Gaelic: Manx Gaelic: Welsh: Breton: Cornish:
Gleann Sonais, Gleann Séin or Gleann Gliondair in Irish; in Scots Gaelic: ?
maol
càirdean
seanair
ogha
Camshron
tapadh leat
glasraichean
buadhaich air
Muir (sea)
Taigh creideimh ?