←
Aragonese laco (cognate)
←
Esperanto lago (cognate)
←
Proto-Indo-European *lókus (derived)
←
Proto-Italic *lakus (derived)
←
Latin lacus (inherited)
←
Portuguese lago (cognate)
←
Sardinian lagu (cognate)
→
Franco-Provençal lac (cognate)
→
Romanian lăcui (suffix)
→
Romanian Lacu (mention)
→
Sardinian lagu (cognate)