Cyril sits next to 3 phonetic neighbors — Cyrus, Cecil, and Carl are the closest matches by sound. Most share Cyril's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"lordly, masterful"
"head, chief (as in penultimate)"
"modern American coinage (rhyming name family)"
"divine smith"
"dweller near the oak trees"
"indivisible, uncuttable"
"little slender one"
"winner, victorious fighter"
"yellow, fair"
"divine gift"
"oak grove"
"nickname for Charles"
"sun ray, luminous"
"God-like, comparable to God"
"noble battle maiden (via Audrey)"
"diminutive of Hugh (heart, mind)"
"meadow of bent grass"
"meadow by the stream"
"lord, warrior who holds land by military service"
"gift from God (popular interpretation)"
Similar sound: These names share phonetic patterns with Cyril — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Cyril.
Rhythm: Cyril is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.