lai.

Uncertain. Several explanations exist. One derives it from Albanian ljaj, itself possibly from Latin flavus, but this is uncertain, and it may be that the Albanian is derived from Proto-Romanian (or Aromanian- compare the cognate laiu, lae in this language). Other theories suggest a Romanian root *gălai, from Latin galla or alternatively an etymology from labes (“fault, defect”), extending the meaning to "spot" and hence, "black" or "dark", but as it is a secondary meaning in Latin, this is not very likely. A more likely explanation may be a relation to the verb la (“to wash”), as lai is used mostly to describe the natural color of wool resulting from washing (compare the similar secondary senses of Spanish crudo, French écru).