Summit sits next to 3 phonetic neighbors — Emmett, Sumner, and Everest are the closest matches by sound. Most share Summit's Old French via Latin-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"highest point, peak"
"marshy land by a lake"
"son of marsh dwellers"
"given in honor of St. Maximilian Kolbe"
"son of Ed, son of the wealthy guardian"
"canal worker, church official"
"rocky cliff, crag"
"world ruler"
"greatest stream (via Maxwell)"
"strong as an oak"
"one who shines, illuminates"
"saint of God, blessed by God"
"modern American name, strong and leading"
"well-spoken, good word"
"otherwise known as, alternate name"
"champion, cloud"
"slender one"
"descendant of the fair one"
"from the kaupa (trading) land"
"rowan tree"
"steep valley settlement"
Similar sound: These names share phonetic patterns with Summit — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French via Latin origins, giving them the same cultural heritage as Summit.
Rhythm: Summit is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.