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"
"fat tail, referring to a grouping of stars"
"of Jove (Jupiter), cheerful and good-humored"
"from the white meadow"
"God has grasped"
"from South Munster (southern Ireland)"
"Little fire (as variant of Aidan)"
"brilliantly renowned"
"highest point, peak, summit"
"frozen water, crystalline coolness"
"valley of pigs"
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.