Lucas means 'light' or 'the one who brings light,' derived from the Latin name Lucius. It carries a sense of brightness and clarity that has kept it appealing across many cultures and centuries.
Lucca
From the Tuscan city of Lucca; the place name shares roots with Luca, deriving from Latin "lux" (light) or the ancient region of Lucania.
Lucero
Light bringer
Lucia
Light, from the Latin lux (light). The same root gives us lucid, illuminate, and Lucifer (literally 'light-bearer').