Where does “laico” come from?

laico (Spanish) comes from Latin lāicus, from Ancient Greek λαϊκός, from Ancient Greek λᾱός, from Proto-Hellenic lāwós, from Proto-Indo-European leh₂wos, from Proto-Indo-European leh₂- — to bark, howl; to be concealed.

laico (Spanish): lay, secular; layman