Who's Who in America" lists 18 O'Malleys, none of them from Baltimore. Eight are in law, five in science or medicine. Surely the editors will want to include the first to be named Martin, the first to be in mayoring.
History, to be sure, has its O'Malleys. Tops, perhaps, would be Grace O'Malley, the pirate. In the 1500s, she "plundered British merchant ships off the stormy Connemara coast," her husband helping; later she met Queen Elizabeth I "as equals." The church has its O'Malleys: Father O'Malley in the films "Going My Way" and "The Bells of St. Mary's." Bing Crosby was only half-Irish, but he could sing real green.
Some O'Malleys are of lesser repute. There are still bars in Brooklyn where you had better not say aloud, "Walter F. O'Malley!" Brooklyn had a baseball team, until Walter moved it to Los Angeles. And look over your shoulder before invoking J. J. O'Malley.