From Latinplumbum, either taken as an early semi-learned term (Latin pl- normally becomes ll- in inherited Spanish), or alternatively, possibly borrowed from medieval Catalan (cf. plom) or Aragonese, or even Mozarabic (as most of the lead in Spain came from Almería in Andalulsia); it is also not impossible that a conservative pronunciation was maintained among the upper classes, considering that it is the name of a metal[1]. The Latin term is related to Ancient Greekμόλυβδος(mólubdos, “lead”), possibly from Etruscan. Cf. also Portuguese chumbo, which was inherited and underwent the regular sound change, and prumo, which is semi-learned.