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"
"of Jove (Jupiter), cheerful and good-humored"
"sudden dash or rush"
"diminutive of Sharon (fertile plain)"
"Little fire (as variant of Aidan)"
"fat tail, referring to a grouping of stars"
"from the white meadow"
"God has grasped"
"valley of pigs"
"brilliantly renowned"
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.