Summitt sits next to 4 phonetic neighbors — Summit, Emmett, and Sumner are the closest matches by sound. Most share Summitt's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"highest point, peak, summit"
"desired, longed for"
"Little fire (as variant of Aidan)"
"sudden dash or rush"
"diminutive of Sharon (fertile plain)"
"brilliantly renowned"
"fat tail, referring to a grouping of stars"
"God has grasped"
"of Jove (Jupiter), cheerful and good-humored"
"valley of pigs"
"from the white meadow"
Similar sound: These names share phonetic patterns with Summitt — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French/Latin origins, giving them the same cultural heritage as Summitt.
Rhythm: Summitt is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.