What country OR backround was your Grandfather ? My grandad's name is Juan Santillan I never met him or saw him . He walked off my fathers family and life when my dad was about 4. My dad's name is Augusto Santillan and his mother's name is Zaida Lopez Santillan. This girl in my highschool who's name is Giselle has my last name!!!! Our last name is rare cause only few people have it . She told her grandad's name ,and it sounded just like your grandfathers.