KENNY: IRL>USA>CAN

We are researching family of Thomas Kenny who came from Ireland in the 1840's potato famine. He landed in USA (either Boston or NYC) and made his way to Barrie, ONT,CAN.A brother was with him.Two other brothers went to Australia.Am looking for information on where in Ireland he was from.Does anyone have information on Kenny's in Ireland that might fit with this?Thanks, Adele Kenny