Elizabeth was probably Watson.Adam Watson & Jane Mollycharaine had a
daughter Eliz.J. b.26 June 1845 Marown. 1881 census shows William Cowell
born in Ballaugh.He could well be your William Henry as he was aged 30
yrs,agr. lab. 7, Glengrenagh, St Anne (Santon)His wife Eliz.31 b. Marown
dau Cath.C.aged 4, Eliz E.aged 3, Will. A. aged1.Adam & Jane moved from 
Marown to Santon,they had a large family (my maternal g.grandmother
Margaret was their daughter. I'll check the parish registers to make
sure that Eliz was their daughter.
You may already know Will and Eliza Skelly had dau. Eliz 12 July 1892
and son Stephen 01 Sep 1900 in Douglas. Marie Radcliffe