Beau sits next to 3 phonetic neighbors — Bo, Belle, and Boe are the closest matches by sound. Most share Beau's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"beautiful, handsome"
"beautiful meadow (speculative Celtic-influenced interpretation)"
"harmony, consonance, fitting together"
"from Scotland"
"powerful, mighty"
"free woman, free person"
"sea, ocean"
"independent"
"God answered, God has spoken"
"fellow countrymen"
"island meadow, island clearing"
"wren, small bird"
"sun, of the sun (folk etymology)"
"from Ing, Norse deity of fertility"
"ruler of elves (Avery root)"
"youthful, soft-haired (from Julia/Julius)"
"beloved, wished-for child"
"fair hero's descendant"
"fond of horses (philos + hippos)"
"raven meadow"
"favorite, precious one"
Similar sound: These names share phonetic patterns with Beau — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have French origins, giving them the same cultural heritage as Beau.
Rhythm: Beau is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.