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"
"one who bails, deliverer"
"rising in the sky, boundary"
"God will increase"
"brave boar"
"from Wells, Somerset"
"gift of God"
"derived from Calvus, bald"
"gift of God"
"God is my strength"
"descendant of Ceallachán"
"one who walks"
"wood, forest; man of the forest"
"blessed, well-spoken of"
"flourishing"
"round hill"
"beloved, may God protect"
"son of the home ruler"
"ancestor's descendants"
"house builder, craftsman"
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.