A quick look at the 1851 census shows only an Alfred Lemon aged 35 living on the Isle of Man. Ten years later there 16 Lemons on the Island! Abraham aged 50, Alfred aged 46, Amelia (36) and Julia (35), plus 12 young Lemons aged between 1 and 18.

I've not come across the family in my general research but I'll keep my eyes open!