Phenix sits next to 4 phonetic neighbors — Phoenix, Fenix, and Felix are the closest matches by sound. Most share Phenix's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dark red, crimson"
"fox-colored"
"God is gracious"
"hat maker, cap maker"
"small forest grove"
"great peace"
"ray of light and land"
"God is gracious"
"noble and ready, prepared for battle"
"manly beauty, sun god"
"strong, powerful"
"victory of the people (via Nicasen interpretation)"
"dweller at the white cultivated land"
"beloved (possibly influenced by love)"
"bold, brave"
"precious, valuable"
"bear strength"
"from Navarre, the plain"
"high, noble, strong"
"from Rome, Roman citizen"
"worker, one who builds"
Similar sound: These names share phonetic patterns with Phenix — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek phoinix origins, giving them the same cultural heritage as Phenix.
Rhythm: Phenix is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.