Upon arriving in the United States, Samuel Goldwyn (whose original Polish name, Schmuel Gelbfisz, was rather unpronounceable) was re-christened "Samuel Goldfish" by a US immigration clerk. Perhaps unsurprisingly, he soon changed his name again to Goldwyn, an amalgam of Goldfish and the name of former partner Edgar Selwyn.
A lawsuit was later brought challenging his right to use the invented name. Goldwyn won. "A self-made man," the judge observed, "may prefer a self-made name."