Shaun sits next to 4 phonetic neighbors — Sean, Shawn, and John are the closest matches by sound. Most share Shaun's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"God is gracious"
"raven's island"
"father of peace"
"strong like a boar"
"qualitative time, the fullness of time"
"lord (if related to Kyrie)"
"victory of the people"
"bright pledge, noble hostage"
"of the Vergilii clan, flourishing"
"great house"
"owner, possessor"
"strip-shaped clearing in woodland"
"from the Egnatius family name"
"hazel valley dweller"
"brave spear, strong with a spear"
"name of God"
"brave power"
"elf friend, noble friend"
"reputation, esteem"
"from Hugh's town"
Similar sound: These names share phonetic patterns with Shaun — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew via Irish origins, giving them the same cultural heritage as Shaun.
Rhythm: Shaun is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.