In Browns 1881 directory under Douglas is
Kew, Henry, coachman, 13 Wellington-square
see http://www.ee.surrey.ac.uk/Contrib/manx/fulltext/bd1881/do_d.htm
I cant find any other Kew in my Victorian directories (nor anywhere else on my reasonably large site)
The name Kew occurs in a number of Manx Place names
The 1881 census gives him as born in England age 58(ocp gardener) born to an Irish wife
with 4 children at home (only Kew family on Island)