2. Irish and Scotish: Anglicized form of any of various Geal, surmanes derived from glas, grey, green, blue; e.g., McGlashan.
3. Jewish : (Ashkenazie); ornamental name from mod. Ger. Glass glass, or occupational name for a glazier or glass blower.
Var.: of 1. Glaze, Glassman; Glazier. Glazyer, Glaisher, Glaysher. of 3: Glas, Glas(s)er, Glasner.