Fidel sits next to 4 phonetic neighbors — Fidell, Fidelio, and Fidele are the closest matches by sound. Most share Fidel's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"faithful, loyal"
"great adviser"
"powerful peace"
"new house, bright place"
"gleaming, shining"
"expulsion, exile (one who wandered)"
"God has made, made by God"
"gift of Isis"
"God is gracious"
"help, helper"
"brave as a wild boar"
"courteous, polite"
"gracious, honorable"
"peace power"
"flower (disputed folk etymology)"
"dedicated, trained, initiated"
"his peace"
"of the Lord, belonging to God"
"magical, sacred water"
Similar sound: These names share phonetic patterns with Fidel — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Fidel.
Rhythm: Fidel is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.