Nilson sits next to 4 phonetic neighbors — Nelson, Nilsson, and Nils are the closest matches by sound. Most share Nilson's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Son of Nils (Neil); son of the champion"
"strong, firm, enduring"
"modern coined name with rhythmic beauty"
"high prominence, brow"
"courageous, valiant"
"son of Copen (geographic surname)"
"Shade or darkness cast by an object blocking light"
"Spiritual refuge and inner peace"
"bright, splendid"
"modern invented name"
"love's path"
"quality, excellence of character"
"wolf counsel (from Ralph)"
"beloved friend, gentle one"
"lamb"
"bright town"
"healer"
"of legend, mythic, extraordinary"
"God is gracious (via Juan/John)"
"may God protect"
"absence of subjection or constraint"
Similar sound: These names share phonetic patterns with Nilson — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse/Scandinavian origins, giving them the same cultural heritage as Nilson.
Rhythm: Nilson is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.