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"
"fair, attractive"
"headland, promontory"
"brave spear, strong with a spear"
"dove, peaceful one"
"handsome, radiant one"
"little fire, fiery one"
"valley, narrow glen"
"place of elms"
"winding river"
"descendant of the salmon"
"descendant of Riagán"
"handsome, fair one"
"reddish-brown (color)"
"warrior"
"son of Gilbert, son of Gib"
"Harry's son, son of the ruler"
"outer wall of a castle (bailey)"
"broad valley"
"warrior's estate"
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.