I AM SEEKING INFORMATION ON MY FAMILY NAME "McGAURAN"

MY GRAND FATHER WAS HARRY G McGAURAN.

I FOUND SOME INFO RELATING,AND DATING BACK TO THE 1600'S,OF "BALLY MAGARUAN" IN CAVAN,CO.,IRELAND....

IS THIS TRUE?..AND WHAT OTHER NAMES ARE THE SAME FAMILY AS McGAURAN?....

THANK YOU,RICHARD McGAURAN
SO.CAL........USA