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Last name origins & meanings:

1. English: from the Old English personal names Lēofa (masculine) and Lēofe (feminine) ‘dear’, ‘beloved’. These names were in part short forms of various compound names with this first element, in part independent affectionate bynames.
2. English: apparently a topographic name for someone who lived in a densely foliated area, from Middle English lēaf ‘leaf’; a certain Robert Intheleaves is recorded in London in the 14th century.
3. Americanized form of Swedish Lö(ö)f, Löv, an ornamental name from löv ‘leaf’.
4. English translation of the Ashkenazic Jewish ornamental surname Blatt.