Kannon sits next to 4 phonetic neighbors — Cannon, Canon, and Kanon are the closest matches by sound. Most share Kannon's Japanese/Sanskrit-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"perceiving sounds, hearing the world's cries"
"brave in battle"
"dark settlement"
"craftsman of fermented beverages"
"powerful spearman"
"messenger"
"ruler of all, universal ruler"
"Yahweh has created"
"shining with fame"
"vigilant in battle"
"help, helper"
"son of Aodh (fire)"
"rock, harmony"
"emperor, caesar"
"third-born or third generation"
"God-like"
"wayfarer, traveler"
"king of birds (folkloric)"
"chief friend, noble friend"
"conviction, guiding principle"
"wealthy guardian"
Similar sound: These names share phonetic patterns with Kannon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese/Sanskrit origins, giving them the same cultural heritage as Kannon.
Rhythm: Kannon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.