Jonas sits next to 5 phonetic neighbors — Jonah, Jones, and Johannes are the closest matches by sound. Most share Jonas's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dove"
"high-spirited person"
"dark-complexioned"
"mortal, earthly"
"associated with the church"
"God is my light"
"Yahweh is merciful"
"greater, superior"
"sea-born, born of the sea"
"exalted father"
"wise protector"
"pledge of peace"
"army man, soldier"
"may God protect, held by the heel"
"gift of God"
"to conquer, to prevail"
"son of Jeffrey, son of God's peace"
"manly, brave"
"one who mills grain"
"rich spear, lucky warrior"
"healer (if derived from Jason/Kason)"
Similar sound: These names share phonetic patterns with Jonas — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew Yonah (יוֹנָה) origins, giving them the same cultural heritage as Jonas.
Rhythm: Jonas is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.