Jonathan sits next to 3 phonetic neighbors — Jonathon, Nathaniel, and Jonah are the closest matches by sound. Most share Jonathan's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God has given"
"from Attica, man of Athens"
"wandering"
"father of peace"
"hound lover, dog enthusiast"
"ruler of the people"
"healer"
"God is gracious"
"little warrior"
"God will increase, he will add"
"woodcutter, carpenter"
"Roman colony at the lake"
"soldier, merciful"
"light, bringer of light"
"brave, lion-hearted"
"the victorious, the conqueror"
"divine present"
"Brock's town"
"God has healed"
"he has heard, God has heard"
"citizen of Rome, Roman"
Similar sound: These names share phonetic patterns with Jonathan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew (Yehonatan) origins, giving them the same cultural heritage as Jonathan.
Rhythm: Jonathan is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.