You may already have this info from the 1881 census. Living at 2 Albert
Terrace, Onchan. (The town of  Douglas  was partly in the Parish of 
Onchan and partly in the Parish of Braddan.
Philip C. Herschfeld , Head, married, 75 yrs, Annuitant, born Tyrol,
Naturalised *( star means more info on actual census film. I'll look
next time I'm at the Manx Museum Library.)
Sarah M. Herschfeld, Wife, married, 69 yrs, born Paisley
Sarah M.       "           ,daughter, unmarried, 24yrs, born Douglas, 
Isle of Man
Esther Cain, servant, unmarried, 45 yrs, born Kirk Santon, Isle of Man
Magie Crellin, servant, unmarried, 19yrs, born Port St. Mary, Isle of Man
Jane Herschfeld daughter, widow, 39 yrs, born ABD (could mean abroad -
 I'm not sure)

In the 1851 census
I have also found Sarah Hirschfield, a married visitor aged 40yrs staying 
at 15, Parade, Douglas born Scotland.  Let me know if you need 1861 or1871 census details. 

Hope this helps. Marie Radcliffe