Roslyn sits next to 4 phonetic neighbors — Rosalyn, Roslyn, and Ross are the closest matches by sound. Most share Roslyn's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"promontory above a pool"
"from Darney (place name)"
"of the Flavian family"
"beloved, dear"
"from Lancy, from the lancet-shaped place"
"one who crosses; toll collector at a crossing"
"spear"
"ash tree settlement (variant of Ashton)"
"beloved, gracious (variant of Erasmus)"
"line of rulers, powerful family succession"
"battle warrior, powerful ruler"
"bright meadow, shire clearing"
Similar sound: These names share phonetic patterns with Roslyn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic origins, giving them the same cultural heritage as Roslyn.
Rhythm: Roslyn is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.