Meaning

noun a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter

noun English composer and conductor (1905-1951)

originFrom Middle English Lambert, from Old French Lambert, a saint's name (of a Bishop of Maastricht) brought to England by the Normans, from Proto-West Germanic *Landaberht, from *land (“land”) + *berht (“bright”). Cognate with Old English Landbeorht, Old High German Lantberht, Dutch Lambrecht.

Etymology from Wiktionary, CC BY-SA 3.0