I think this William Coghlan is a relative. But not sure how.
I have found that my line of Coghlan's in Boston (Timothy Coghlan married Ellen Mccarthy) daughter Mary Isabella who married Edward J Longley who moved to Seattle, WA and had daughter May Cecilia. Mary Isabella died as Mary Langlois and husbands name on death certificate is Edward Langlois. Edward died in 1951 in Hennepin County Minnesota as Edward J Langlois. May's name was legally changed at the age of 12 to Mary Cecilia Langlois.
Also found that Timothy Coghlan came to US with a brother.
William in Seattle I think is an Uncle to my grandmother Mary Cecilia.... But haven't figured the link yet of how.