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"
"healer"
"healer (from Greek Jason)"
"son of Andrew (manly)"
"may God protect"
"possibly from a- (not) + treo (tremble)"
"Poecc's estate; Poecc's settlement"
"high-spirited person"
"the crowned one"
"selected, set apart, elected"
"ruler of the army"
"modern American coinage, son of Case"
"the victorious (Arabic city name)"
"strong man, warrior"
"pilgrim to Rome; from Rome"
"rowan tree (mountain ash)"
"holy, sacred one"
"Greek transliteration of Hebrew Toviyah"
"valiant, brave"
"wealth, fortune, prosperity"
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.