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"
"from Amiens (France)"
"emperor, caesar"
"son of Jack"
"slender and fair"
"great, powerful"
"near the holly trees"
"strength, permanence"
"son of the victor"
"small songbird"
"of Mount Carmel"
"wealthy guardian"
"oarsman"
"sandalwood tree"
"heir, descendant, beloved"
"of the forest; woodland"
"wood, forest"
"to follow a course, leave a mark"
"trained, experienced"
"serious, determined, vigorous"
"promised land, heavenly realm"
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.