Searching for Peter Kane - Born 1780

Hello and thank you in advance if anyone can shed some light.

My ancestor Peter Kane was born somewhere near Galway in 1780.  I have not found much to go on to trace him other than his son John was born in 1818 and immigrated to the US in 1843.

I found an entry in the Tuam parish registry from Dec 5, 1807 noting the marriage of Peter Kane and Mary Bird Turlonshan (? last name difficult to read).  The marriage was witnessed by Beverly Bird.

Since the dates seem to make sense I am assuming that this is my ancestor's marriage.

Here are my two questions -

In that time in Ireland would a woman using two last names like this be a widow?

Would it be reasonable to assume with such limited information that this Peter Kane is the same man who later lived in Galway?

Regards and thanks again for any help,

 

Mark Kane

Brentwood, California, USA