Jeferson sits next to 3 phonetic neighbors — Jefferson, Emerson, and Anderson are the closest matches by sound. Most share Jeferson's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Jeffrey, son of peace"
"people's power"
"that which is believed"
"acquired, gotten"
"dark red, crimson"
"little fire"
"lord, ruler"
"God perceives"
"whole, universal"
"God strengthens"
"God is my judge"
"modern American creation"
"belonging to God"
"who is like God? (rhetorical — no one is)"
"unity, one"
"modern invented name"
"beloved son"
"son of David, from Hebrew Dodavahu (beloved)"
"spear wood (ash was used for spears)"
"Yahweh has bestowed"
Similar sound: These names share phonetic patterns with Jeferson — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Jeferson.
Rhythm: Jeferson is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.