Ioannis sits next to 4 phonetic neighbors — Yannis, Yiannis, and Giannis are the closest matches by sound. Most share Ioannis's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious; Yahweh shows favor"
"rejoice, be glad"
"the Lord recalled"
"lord, my lord"
"completion, eternity"
"gift of Isis"
"earth mother's follower"
"dragon, serpent"
"of the hunt, belonging to Artemis"
"defender of men, protector of the people"
Similar sound: These names share phonetic patterns with Ioannis — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Ioannis.
Rhythm: Ioannis is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.