Proto-West Germanic *blāu

→ Afrikaans blou (inherited)

→ Old English blaw (inherited)

→ German blau (inherited)

→ Middle Dutch blau (inherited)

→ West Frisian blau (inherited)

→ Old High German blao (inherited)

→ Alemannic German blaaw (inherited)

→ Hunsrik blau (inherited)

→ Hunsrik blo (inherited)

→ Luxembourgish blo (inherited)

→ Dutch blauw (inherited)

→ Old Saxon blao (inherited)

→ Saterland Frisian blau (inherited)

→ Vilamovian błöw (inherited)

→ Yiddish בלוי (inherited)