Ruaridh sits next to 4 phonetic neighbors — Rory, Ruari, and Ruri are the closest matches by sound. Most share Ruaridh's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"red king, red-haired ruler"
"basket-maker"
"Creative modern name; heart-centered"
"follower of Christ, anointed one"
"Hroda's island, famous land"
Similar sound: These names share phonetic patterns with Ruaridh — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish ruadh (red) + rí (king) origins, giving them the same cultural heritage as Ruaridh.
Rhythm: Ruaridh is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.