Cygnus sits next to 4 phonetic neighbors — Sygnus, Cyrus, and Silas are the closest matches by sound. Most share Cygnus's Latin-origin cluster, so the rhythm and vowel shape carry across the list.
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"swan"
"God is gracious"
"nickname for Esteban (crowned one)"
"equal, level, balanced"
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"cultural Hmong name with tonal meaning"
"Bright light, torch, shining one"
Similar sound: These names share phonetic patterns with Cygnus — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Cygnus.
Rhythm: Cygnus is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.