Bolt sits next to 4 phonetic neighbors — Bode, Balt, and Cole are the closest matches by sound. Most share Bolt's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sudden dash or rush"
"One who helps or assists"
"from the white meadow"
"valley of pigs"
"from South Munster (southern Ireland)"
"of Jove (Jupiter), cheerful and good-humored"
"frozen water, crystalline coolness"
"fat tail, referring to a grouping of stars"
"highest point, peak, summit"
"brilliantly renowned"
"God has grasped"
Similar sound: These names share phonetic patterns with Bolt — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Bolt.
Rhythm: Bolt is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.