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As an English surname, from Middle English Lumb, from Old English Lumm, from lumm (“pool”). Analyzable as being from English lum (“pool”). As a Chinese surname, from Cantonese 林 (lam4).

Clipping of Columbus.

Borrowed from Scots lum, Early Scots lumb; further etymology uncertain, but probably from Cumbric *lümon, related to Welsh llumon (“chimney”) (obsolete), from Proto-Celtic *loimono. Possibly at least influenced by Old French lum (“light”), lume (“cooking fire”) (compare French lumière (“light; cavity or channel within a tube or tubular organ, lumen; opening”)), from Latin lūmen (“light; light source; opening through which light can penetrate such as an air-hole or window; opening or orifice in a water-pipe or funnel”), ultimately from Proto-Indo-European *lewk- (“bright; to see; to shine”).

Uncertain; perhaps related to Old Norse lundr (“clump of trees, grove; (rare) tree”) (compare Danish lund (“grove”), Norwegian Bokmål lund, Norwegian Nynorsk lund (“grove”), Swedish lund (“grove”)).

Unknown. The Dictionary of the Scots Language (in their entry on Scots lum (“downpour”)) mentions a dialectal Middle English word lum(b) (“water hole in a mire; deep pool”) and suggests it might ultimately be related to lum (“chimney”).