Yiannis sits next to 4 phonetic neighbors — Yannis, Giannis, and Ioannis are the closest matches by sound. Most share Yiannis's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"the unseen"
"to set, to place, to establish"
"gift of the goddess"
"sea god, messenger of the deep"
"sound, reverberation"
"of the earth mother"
"the Lord recalled"
"sky, heaven (root)"
"mourner"
"victorious among people"
"dragon, serpent"
"God's gift"
"of the gods"
Similar sound: These names share phonetic patterns with Yiannis — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Yiannis.
Rhythm: Yiannis is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.