Jaycee sits next to 5 phonetic neighbors — Casey, Lacey, and Tracey are the closest matches by sound. Most share Jaycee's American-origin cluster, so the rhythm and vowel shape carry across the list.
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"phonetic rendering of initials J and C"
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Similar sound: These names share phonetic patterns with Jaycee — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have American origins, giving them the same cultural heritage as Jaycee.
Rhythm: Jaycee is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.