Calyx sits next to 4 phonetic neighbors — Calix, Felix, and Alex are the closest matches by sound. Most share Calyx's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"cup, chalice"
"gift of God (via Matthew)"
"elevated, grand"
"color, vibrant shine"
"fame-land, renowned in the territory"
"noble friend"
"fiery one"
"immense quantity, boundless"
"archangel name variant"
"of the royal house, noble"
"man from South Munster (southern Ireland)"
"gift of God"
"possession, acquisition"
"heart, courageous heart"
"Yahweh is God"
"descendant of Bradan (salmon)"
"God is gracious (via Jack/John variant)"
"from the open, beloved"
"powerful in battle (alternate interpretation)"
"variant of Aidan, meaning little fire"
Similar sound: These names share phonetic patterns with Calyx — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Calyx.
Rhythm: Calyx is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.