From an Old English personal name derived from ælf ‘elf, supernatural being’ + wine ‘friend’. This was not especially common in Britain either before or after the Norman Conquest, but it is popular in the United States. The reasons for this are not entirely clear; association with Calvin may be a factor. A more plausible (though less elevated) explanation is that this was the name given to the naughty chipmunk in a popular television cartoon series of the 1960s.
English and French: nickname for a gambler or for someone considered fortunate or well favored, from Middle English, Old French fortune ‘chance’, ‘luck’. In some cases it may derive from the rare medieval personal name Fortune (Latin Fortunius).