Bo sits next to 4 phonetic neighbors — Beau, Joe, and Moe are the closest matches by sound. Most share Bo's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"to live, to dwell"
"superlative of magnus (great)"
"bright in mind and spirit"
"high-spirited person"
"deep valley; hollow valley"
"mill worker, grain grinder"
"God's helper (ezer + El)"
"son of Andrew (manly)"
"dog (symbol of loyalty)"
"thunder and lightning"
"substitute, replacement"
"from the south village"
"handsome, beautiful"
"Frankish person"
"first, chief"
"distinguished, bright"
"dark one, black"
"crown, wreath"
"from the bridges"
"of the Cassian family (Roman gens)"
"resolute protector's son"
Similar sound: These names share phonetic patterns with Bo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse origins, giving them the same cultural heritage as Bo.
Rhythm: Bo is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.