try www.manxnotebook.com/famhist/families/awm1889/stvnsn_b.htm for one Manx Stevenson family and
www.manxnotebook.com/famhist/families/awm1889/stvnsn_l.htm for another offshoot

my search engine www.manxnotebook.com/search.htm brings up 450 pages with name including several wills