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"
"little fire"
"ruler of the people"
"defender of men"
"From the Middle English 'couper' or Middle Low German 'kuper'; an o..."
"stone"
"strong as a lion"
"divine messenger, heavenly being"
"healer"
"anointed one"
"who is like God?"
"soldier"
"rich protector"
"horseman, knight"
"rock, stone"
"industrious, hardworking"
"young horse tender"
"jet black; speed"
"magic dignity"
"from Hadria, of the Adriatic"
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.