isabella coakley

Our great aunt married an American named Coakley about 1912 or thereabouts and went to California.We were told it was Aunt Charlotte but she may have been known as Isabella Coakley. We believe she died prior to 1920. (family folklore says an earthquake?) We can't find Mr Coakleys first name but I wonder if anybody recognizes this Sydney, Australia connection? Any help would be appreciated.