ANGEL ISLAND - Her friends call her Judy.Her students call her Professor Yung. Judith Yung appears on her birth certificate.But to Mom and Dad and her Chinese school teacher, she was always Bick Fong.Her original family name, Tom, not Yung, was a secret closely guarded from outsiders for a generation."Within the community and within families people knew what your real names were," Yung said. "I thought it was normal because everyone else was like that."Rebuffed by the Chinese Exclusion Act, nearly an entire generation of Chinese immigrants to the Bay Area came in under assumed or "paper" names and identities,...