French lucarne

← German Luke (cognate)

← English lock (link)

← Middle French lucarne (inherited)

← Middle French luquarme (mention)

← Old French lucanne (inherited)

← Proto-Germanic *lūkinjō (derived)

← Proto-Germanic *lūkaną (mention)

← Middle Low German lūke (cognate)

← Proto-Indo-European *lewg- (derived)

← Dutch luik (cognate)

→ English lucarne (borrowed)

→ English luthern (derived)

→ Romanian lucarnă (borrowed)