Proto-Indo-European *h₂élis-

→ English alder (inherited)

→ English ольха (inherited(en/ru))

→ Old English alor (inherited)

→ German Erle (derived)

→ Basque haltz (derived)

→ French alise (derived)

→ Ancient Greek ἄλιζα (link)

→ Latgalian eļksnis (inherited)

→ Latvian alksnis (mention)

→ Dutch els (inherited)

→ Old Norse elri (derived)

→ Old Norse ǫlr (derived)

→ Old Norse elrir (derived)

→ Polish olcha (mention)