My Stenson ancestry is from Ireland - county Litrim and county Longford.My GGGrandfather was Patrick Stenson.He married Catherine Smythe in 1837.They had 5 children (Thomas - b. 1838, Mary - b. 1842, Patrick [my GGrandfather] - b. 1846, Elizabeth - b. 1850 and James - b. 1853).My GGrandfather (also Patrick Stenson) married twice - first to Winnie Clancy.They had 2 sons (Bernard - b. 1878 and Patrick - b. 1882).With his second wife, he had mu Grand father (James - b. 1853) who immigrated to the USA in the early 1900s.
My searches also discovered that there are quite a few Stensons in county Sligo (next to Litrim).I haven't been able to tie in the Sligo Stensons to the Litrim Stensons.