Nikolaus sits next to 4 phonetic neighbors — Nicholas, Nikolai, and Nikolas are the closest matches by sound. Most share Nikolaus's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"victory of the people"
"white"
"one who carries Christ within"
"bright spirit, shining mind"
"consecrated, revered"
"of the earth mother"
"gift of God"
"elf ruler"
"home ruler"
"the Lord recalled"
"gift of God"
"to set, to place, to establish"
"YHWH has shown favor"
"farmer, steward of land"
"shining glory"
"deciding warrior"
"sound, reverberation"
Similar sound: These names share phonetic patterns with Nikolaus — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Nikolaus.
Rhythm: Nikolaus is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.