Arnulfo sits next to 3 phonetic neighbors — Rodolfo, Arnaldo, and Adolfo are the closest matches by sound. Most share Arnulfo's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"eagle wolf"
"new house, bright abode"
"beautiful, handsome"
"God will add / God shall increase"
"of the golden family (Aurelii)"
"sixth"
"of the sun, relating to the sun"
"free man"
"powerful ruler"
"symbol of peace and wisdom"
"copper island native"
"happy, fortunate"
"rib, side"
"God is gracious"
"little messenger of God"
"short form of Arnold (eagle ruler)"
"famous home, famous in homeland"
Similar sound: These names share phonetic patterns with Arnulfo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Arnulfo.
Rhythm: Arnulfo is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.