"I was told by my father, Ramon Frausto Sr. who himself was born in Mexico city, that his grandfather was of german jewish descent, and the original surname was Fraustenberg, later changed to Frausto to sound spanish in mid 1800's.
From there the name remained the same, yet the offsprings were many and they spread throughout Mexico, Baja California, Texas, Chicago, etc."
I found this post on a different site, contact me if you want me to send you the link. I haven't tried to get a hold of this person to see if we're related but I will when I learn more from my mom. Maybe we're related.