Felix sits next to 4 phonetic neighbors — Phelix, Alexi, and Dexter are the closest matches by sound. Most share Felix's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"happy, fortunate"
"God strengthens"
"God is gracious"
"man from Sebaste"
"beloved son"
"dark red, crimson"
"phonetic creation, no traditional meaning"
"hillock, small hill"
"free man"
"asked for, prayed for"
"universal, whole"
"son of the sea"
"from Judah (the tribe)"
"ruler of the elves"
"light, bringer of light"
"son of Grey"
"little blessed one"
"Beauty, grace"
"handsome; fair one"
"son of Carr (marsh dweller)"
"from Hadria, of the Adriatic"
Similar sound: These names share phonetic patterns with Felix — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Felix.
Rhythm: Felix is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.