The Latin characters uppercase U+A7DA and lowercase U+A7DB were added to the Unicode Standard 16.0 released on 10 September 2024 (Delta Code Charts, Latin Extended-D, Range: A720–A7FF). Before their adoption, only the Greek character λ U+03BB was available to represent the letter used in Latin orthographies,λugʷē was or is written with the Greek character.
Franz Boas, Helene Boas Yampolsky & Zellig S. Harris (1947), “Kwakiutl Grammar with a Glossary of the Suffixes”, inTransactions of the American Philosophical Society[1], volume37, number 3, page307
Franz Boas, Helene Yampolsky, and George Hunt (1948),Kwakiutl Dictionary[2], page423