Niko sits next to 4 phonetic neighbors — Nico, Miko, and Theo are the closest matches by sound. Most share Niko's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"victory of the people"
"from Lucania"
"strong, healthy"
"fortune's keeper"
"the healer (Iason)"
"Free man, Frenchman"
"descendant of Dorus, Dorian Greek"
"gift of God, gift of Yahweh"
"defender of men"
"favored by the gods"
"bane, destruction (war god)"
"ruler of the army"
"eternal ruler, ever powerful"
"of the gens Lucia (light)"
"God is gracious"
"of Mars, warlike"
"counsel's guardian"
"battle cry"
"bold counsel"
Similar sound: These names share phonetic patterns with Niko — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Niko.
Rhythm: Niko is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.