Bijou sits next to 4 phonetic neighbors — Bijoux, Bejou, and Beau are the closest matches by sound. Most share Bijou's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"jewel, precious gem, little treasure"
"creative modern name, beloved one"
"One who abstains from forbidden things"
Similar sound: These names share phonetic patterns with Bijou — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have French, from Breton bizou (ring) origins, giving them the same cultural heritage as Bijou.
Rhythm: Bijou is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.