Yes, I realised that, when I looked at the 1911 census - that he was probably named William Stanley after his father.

I copied it in case you don't have it [Findmypast household transcript]:
Name Relation Condition/Yrs married Se x Age BirthYear Occupation Where Born
MCGLASKEN, William Head Married 13 years M 37 1874 General Labourer Isle of Man Douglas
MCGLASKEN, Ellen Wife Married F 35 1876 Isle of Man Douglas
MCGLASKEN, May Daughter F 12 1899 School Isle of Man Douglas
MCGLASKEN, William Son M 10 1901 School Isle of Man Douglas
MCGLASKEN, Louisa Daughter F 8 1903 Isle of Man Douglas
MCGLASKEN, Stanley Son M 4 1907 Isle of Man Douglas
MCGLASKEN, Isabel Daughter F 3 1908 Isle of Man Douglas
MCGLASKEN, Douglas Son M 1 1910 Isle of Man Douglas
--------------------------------------------------------------------------------
RG number:RG14 Piece:34677 Reference:RG14PN34677 RD635 SD3 ED18/24 SN137
Registration District:Isle of Man Enumeration District:18/24 Parish:Conchan
Address:
14 Grafton St Douglas County:Isle of Man

The scan shows that the name was actually written as McGlashen, and that Ellen had had 8 children born alive with 6 living.

Sue