Jeffery sits next to 4 phonetic neighbors — Jeffrey, Geoffrey, and Jefferson are the closest matches by sound. Most share Jeffery's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pledge of peace, divine peace"
"emperor, supreme ruler"
"sacred song, hymn"
"courage, bravery"
"one who works with books"
"tumult, noise"
"from the mouth of the Roe river"
"variant of Lakin: small play, sport"
"Kryptonian birth name of Superman"
"brave bear, strong as a bear"
"bright fame"
"flax, flaxen-haired"
"God has been gracious"
"continuous improvement (kaizen-inspired)"
"strong as a lion"
"God has exalted (Jah + kai)"
"son of Nicholas, victory of the people"
"hill, high ground"
"outer wall of a castle (bailey)"
"cart maker, transporter"
"valley dweller, from the valley"
Similar sound: These names share phonetic patterns with Jeffery — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic via Old French origins, giving them the same cultural heritage as Jeffery.
Rhythm: Jeffery is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.