Nilo sits next to 5 phonetic neighbors — Milo, Nilo, and Leo are the closest matches by sound. Most share Nilo's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"champion, cloud"
"strong as an eagle"
"belonging to the Lord"
"God is gracious"
"God is gracious, Yahweh is gracious"
"lord of the marches, border lord"
"of the Fabian clan"
"of Rome, strength"
"rejoice"
"hidden valley river"
"descendant of Raghallach"
"from Sebastos (venerable city)"
"famous ruler"
"black"
"triumphant one"
"lucky, fortunate, auspicious"
"given by God"
"strength of God"
"the beginning, the start"
Similar sound: These names share phonetic patterns with Nilo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish via Finnish origins, giving them the same cultural heritage as Nilo.
Rhythm: Nilo is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.