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Last name origins & meanings:

1. English: from the Middle English personal name Lefman, Old English Lēofman, composed of the elements lēof ‘dear’, ‘beloved’ + mann ‘man’, ‘person’. This came to be used as a nickname for a lover or sweetheart, from Middle English lem(m)an. There is no connection with the word denoting the citrus fruit (which is of Persian origin).
2. Scottish and northern Irish: variant of Lamont.