Nicolai sits next to 3 phonetic neighbors — Nikolai, Nicholas, and Nicola are the closest matches by sound. Most share Nicolai's Russian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"champion of the people"
"heri (army) + beraht (bright)"
"born at Easter"
"army man, soldier"
"manly, brave, virile"
"will-helmet"
"defender, helper of mankind"
"estate ruler, powerful home"
"young warrior, young man"
"free ruler, powerful peace"
"wise army, counsel warrior"
"proclaimer of peace"
"son of Lars (son of Lawrence)"
"male, virile"
"protector of people"
"army friend, honorable companion"
Similar sound: These names share phonetic patterns with Nicolai — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Nicolai.
Rhythm: Nicolai is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.