The 21 surnames begin with G

Gartner (3)
Gasser (3)
Gassner (1)
Gatterwe (2)
Gattler (1)
Geiger (5)
Gilg (1)
Göls (1)
Grabner (1)
Graf (2)
Grasteiner (1)
Greisl (3)
Griehsmüllner (1)
Griesmüller (3)
Gritschenberger (2)
Gross (2)
Gruber (1)
Grünbacher (1)
Grünner (1)
Gundacker (4)
Guttmann (5)