Ruairi sits next to 4 phonetic neighbors — Rory, Ruaraidh, and Rhodri are the closest matches by sound. Most share Ruairi's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"red king"
"God has remembered"
"handsome, beautiful"
"archer, warrior of the yew"
"fair warrior, fair hero"
"peace, purity"
"defender of men"
"wolf counsel (from Ralph)"
"fire, flame (poetic interpretation)"
"from Sebaste (via Sebastian)"
"chief, ruler"
"symbol of wisdom and knowledge"
"from the Afton river"
"from the fort (place name origin)"
"westward direction"
"son of Roderick"
"descendant of Cathasach"
"handsome, beloved"
"ancient, enduring"
"cold well; from the cold water source"
Similar sound: These names share phonetic patterns with Ruairi — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish ruadh (red) + ri (king) origins, giving them the same cultural heritage as Ruairi.
Rhythm: Ruairi is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.