Jon sits next to 5 phonetic neighbors — John, Sean, and Shawn are the closest matches by sound. Most share Jon's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"sky father, divine sky"
"tall stone"
"renowned warrior"
"dark settlement"
"my God is salvation"
"victory of the people"
"from the city of lions"
"serious, determined, vigorous"
"one who lives near the fens or marshes"
"shepherd, one who tends sheep"
"roof maker"
"Yahweh has shown favor"
"case, container (via Old French)"
"spiritually reborn through baptism"
"follower of Dionysus"
"little red-haired one"
"bold and modern (cultural meaning)"
"faithful, loyal, trustworthy"
"courteous, well-bred"
"shield wolf, protector"
Similar sound: These names share phonetic patterns with Jon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Jon.
Rhythm: Jon is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.