Dvorak m Dellamonica in CA maybe

First can someone tell me what nationality Dvorak is?(well usually anyway)

I'm trying to learn anything I can about Marsha J Dvorak who married James Marvin Dellamonica . They may have married in CA The date Dec Dec 9 1972 appears with them, in the information I have , but I'm not sure why. James was born Dec 23 1925.His parents were Marjorie Sinnott and Louis Dellamonica.His grandparetns were
Julian(Giulian) Dellamonica and Celesata Cosmini . Think they both may have been born in Switzerland or Italy.

Who were Marsha's parents, siblings, and where and when were she and her siblings born. If not in USA when did she/they immigrate? Name of ship.In short I'd appreciate anything I can learn about Marsha.

Thank you.
Barbara