Shanon sits next to 3 phonetic neighbors — Shannon, Shannan, and Shanan are the closest matches by sound. Most share Shanon's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"old river; ancient one"
"Beloved"
"song, carol"
"God is gracious"
"queen, regal grace"
"Possibly from derdriu, meaning raging woman or feared one"
"a fertile plain by the sea"
"dear one, beloved"
"yew wood"
"dear friend, beloved companion"
"creative coinage combining Mon- (advisor) and -ella (beautiful)"
"defender of men"
"short form of Edith"
"iris flower"
Similar sound: These names share phonetic patterns with Shanon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish origins, giving them the same cultural heritage as Shanon.
Rhythm: Shanon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.