Surname Guapalia?

I just received a copy of my great grandfather Teodoro de Alba's death
certificate which lists his mother's name as "Synthia Guapalia". The
informant was his oldest son. I have always been told his mother's surname
was Gonzales, but we have no documentation of this. Could Guapalia be a
misspelling of Gonzales, or is it a real surname?

Steve Compton