Glad you asked...
With a little Irish luck, you will have many, many happy birthdays. To say Happy Birthday in Irish, say Breithla sona duit. It is Irish tradition to gently bump a child on the floor upside down on their birthday.
Then again, this answer might help you...
The language Gaeilge is spoken in Ireland. The language is usually referred to in English as Irish. The Happy Birthday is Irish is Go maire tu do la breithe.

