Niklaus sits next to 4 phonetic neighbors — Nicholas, Niklas, and Klaus are the closest matches by sound. Most share Niklaus's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"victory of the people"
"sun"
"lotus, water lily"
"rejoice, be glad"
"elf warrior"
"emperor, supreme ruler"
"bright-headed"
"soaring vessel, sky wanderer (symbolic)"
"God is gracious (John root)"
"alder tree"
"divine protection"
"one with a sacred name"
"YHWH has been gracious"
"elevated, sublime, high"
"conqueror, victor"
"will, desire, helmet"
"son of Nicholas, victory of the people"
"power of the gods"
"may God protect"
"village of the cross, farm by the cross"
"bearer of Christ"
Similar sound: These names share phonetic patterns with Niklaus — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Niklaus.
Rhythm: Niklaus is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.