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"
"agreement to stop fighting, temporary peace"
"companion, fellow traveler"
"son of the firebrand (short for Tyson)"
"heathland, open moorland"
"God heals"
"near the holly trees"
"at the holly trees"
"shield wolf, protector"
"spear ruler"
"slender and fair"
"holy, sacred place"
"God will add, God will increase"
"brave in battle"
"son of the brown-haired one"
"river (from Celtic afon)"
"bold counsel, brave advisor"
"God shall add (another son)"
"wise as a wolf"
"song sung to a stringed instrument"
"one who cares for others"
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.