My g-grandfather Mortimer was born in 1826, settled in Braintree, MA. There were other Gallivans in the area but I have not established any connections yet. There was a James Gallivan born in 1836 who settled in Franklin, MA. His parents were Cornelius Gallivan and Margaret Bresnahan. If you e-mail me at firstname.lastname@example.org
I can arrange to send you more info on my tree.