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"
"power, might"
"from Lancy, from the lancet-shaped place"
"one who crosses; toll collector at a crossing"
"beloved, gracious (variant of Erasmus)"
"of the Flavian family"
"dove (the bird)"
"ash tree settlement (variant of Ashton)"
"from Darney (place name)"
"bright meadow, shire clearing"
"spear"
"battle warrior, powerful ruler"
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.