John and Rosalie Vondra

John Vondra came to America from Bohemia. On many documents I also see he uses the name Jan Vondra. This appears on his wedding certificate to Rosalie. Although Mildred, my grandmother, told her daughter Elaine that her mother's correct spelling of her name was Rozalie. Her mother spelled her name Rosalie Bares on the ship's passenger list and her marriage certificate to John (Jan) Vondra. Only the Death Notice, which is in Czech, is spelled Rozalie. She was also noted in that story to be called Rozena Baresova. I learned that the (ova) at the end of the last name identifies the reader that the person is a woman. So for the Cervenka family.... The girls would be Cervenkova. meaning a girl of the Cervenka family.
Regarding the name of Vondra Census. Vondra is a well-used surname, ranking 38891 out of 88799 for people of all ages in the 1990 U.S. Census.