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"
"Sorrowful one, broken-hearted"
"plain, fertile flatland"
"short form of Edith"
"creative coinage combining Mon- (advisor) and -ella (beautiful)"
"iris flower"
"defender of men"
"blessed friend, holy and peaceful"
"archer's bow (yew)"
"God is gracious"
"queen, regal grace"
"dear one, beloved"
"free woman, dear one"
"Beloved"
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.