Carlyn sits next to 4 phonetic neighbors — Carolyn, Carlin, and Carly are the closest matches by sound. Most share Carlyn's English-origin cluster, so the rhythm and vowel shape carry across the list.
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"free woman"
"grace, favor"
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"in the beginning"
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"air, melody"
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Similar sound: These names share phonetic patterns with Carlyn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Carlyn.
Rhythm: Carlyn is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.