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"
"little fire, fiery one"
"reputation, esteem"
"God exists, gift"
"red river settlement"
"descendant of Aodh (fire)"
"elm grove"
"champion"
"son of Harry, home ruler"
"bright-headed warrior"
"from the River Irvine"
"little poet, little philosopher"
"brave spear, strong with a spear"
"fair, white (from Finn)"
"land of Eoghan (Owen)"
"Yahweh has shown favor"
"dark, swarthy"
"universal, whole"
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.