By surface analysis, на- (na-) + Proto-Slavic *lěpъ (“glued”).
на́леп • (nálep) m
- accretion, coating
- гноен налеп ― gnoen nalep ― suppurative exudation
- “налеп”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
- “налеп”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010