Cyan sits next to 5 phonetic neighbors — Ryan, Sian, and Zion are the closest matches by sound. Most share Cyan's Greek via English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"blue-green color"
"pure"
"Scottish pet form of Margaret"
"to feel great joy, to be glad"
"heavenly flower of the night"
"meadow or woodland clearing"
"Pleiades star cluster, dawn light"
"friend, ally"
"my delight, my pleasantness"
"blue, the color of sky and sea"
"powerful, mighty"
"noble kind, of noble birth"
"bold, fierce settlement"
"meadow, clearing"
"protector of people"
"beloved of God, God is exalted"
"cheerful, merry"
"you will always be loved"
"grace, favor"
"butterfly (via Vanessa)"
Similar sound: These names share phonetic patterns with Cyan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek via English origins, giving them the same cultural heritage as Cyan.
Rhythm: Cyan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.