Mayor Kevin White's new daughter, Patricia Hagan White, is held by godmother, Mrs. Lawrence Cameron of Hyde Park, during christening last night. Celebrated in the Mayor's Beacon Hill residence, at the rites were: (from left) Mrs. Patricia White, mother of the Boston Mayor, Mayor White, Christopher, 3, Mrs. Kathryn White, Catlin, 10, Rev. Gerald Bucke, St. Joseph's Church, West End, and godfather, Richard Dray of Milton