Have Belshaw S from Ireland Gone Off the Planet

I would love someone who was or is a BELSHAW with connections to IRELAND to contact me.

My Great Great Grandmother who was MARGARET BELSHAW born about 1810 either before then or just after then I haven't got her exact date of birth. She married HUGH HALL COCHRAN, but I can't find out anything about her or her BELSHAW family.Or her parents or siblings. Have all the IRISH BELSHAW'S disappeared forever,?

Please help.

Heppy