Sean sits next to 3 phonetic neighbors — Shawn, Shane, and Shaun are the closest matches by sound. Most share Sean's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"gift, one who was given"
"precious, lovely (blend of Alana and Amanda influences)"
"daylight, brightness"
"little star, radiant one"
"gift of God"
"born on Christmas Day"
"life"
"Bright and clear; variant of Serena"
Similar sound: These names share phonetic patterns with Sean — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Sean.
Rhythm: Sean is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.