Galactosemia commonly is due to deficiency of
Galactose-1 phosphate uridyl transferase 
Galactosemia is due to deficiency of :

Galactose-1-phosphate uridyl transferase (most common and best known),
Galactokinase, and
UDP-Galactose-4-epimerase.
Galactose-1 phosphate uridyl transferase
Galactose-1 phosphatase
Glucose-1 phosphatase
Glucose-6 phosphatase