There is not a maiden name on the Census. It shows the following:
Snow, Walter, male, Head, married, birth Apr 1875, age 36, birthplace England, profession laborer;
Snow, Matilda, female, Wife, married, birth Feb 1881, age 30, birthplace England;
Snow, Walter, male, Son, single, birth Aug 1903, age 7, birthplace England; Snow, George, male, Son, single, birth Jul 1906, age 4, birthplace England; Snow, Beatrice, female, Dau, single, birth Aug 1910, 10/12 mos., birthplace Ontario.
The immigration list (1909) of shows the destination as Brantford for Matilda, Walter and George. The senior Walter must have already been there.