Carlyle sits next to 4 phonetic neighbors — Carlisle, Carlin, and Carlo are the closest matches by sound. Most share Carlyle's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the fortified city"
"open lands, clearing"
"devoted to God"
"modern invented name"
"respectful connection"
"healer (if from Jason)"
"defender of men, protector of mankind"
"rejoicing in the way"
"place by the lake"
"modern American creation, one of a kind"
"my God is the Lord (Yahweh)"
"son of (Celtic prefix) + divine"
"legacy, something handed down"
"youth, pup"
"marshy meadow"
"entire, all-encompassing"
"God is gracious (via Zane/John)"
"fearless one"
"from the winding stream or lane"
"modern invented name, possibly from bay + -lan suffix"
"God is my judge + priceless/flourishing (Dan + Anthony)"
Similar sound: These names share phonetic patterns with Carlyle — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Welsh via English origins, giving them the same cultural heritage as Carlyle.
Rhythm: Carlyle is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.