Beannachet Le Fheille Padraig

Beannachet should be spelt "Beannachtaí", it means "Blessings".

Le Fheille Padraig should be spelt "Lá Fhéile Pádraig", it means "St. Patricks Day".

The proper way to wish someone a happy St Patrick's day is:

Beannachtaí na Féile Pádraig ort (singular)

Beannachtaí na Féile Pádraig oraibh (plural)