"Variant of Seymour"
The name Sy is commonly a male name from the "English" origin.
Sy is an English short form of Seymour, and the same spelling is used as a short form of Sylvester. It is a spelling of the spoken nickname rather than a name with an independent root, so it carries no meaning of its own beyond the full name it shortens. The name appears in United States birth records from 1917.
Seymour means "From the moors by the sea.".
The pronunciation of Sy is SY.
