Seamus sits next to 3 phonetic neighbors — James, Shamus, and Hamish are the closest matches by sound. Most share Seamus's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"supplanter"
"bright pledge, noble hostage"
"green river, fresh water"
"land of Eoghan (Owen)"
"warrior, fighter"
"guardian of riches"
"winding valley"
"son of Adam"
"resolute protector"
"descendant of Ceallach"
"no one equals God"
"God exists, gift"
"peninsula, point of land"
"place of elms"
"messenger of God"
"holy river"
"descendant of the king"
"fair, attractive"
"chariot boy"
Similar sound: These names share phonetic patterns with Seamus — 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 Seamus.
Rhythm: Seamus is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.