Marlyn sits next to 5 phonetic neighbors — Marilyn, Marlene, and Marlee are the closest matches by sound. Most share Marlyn's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"beloved lake; sea of bitterness + lake"
"seller of arrows"
"gift from God (folk etymology)"
"watchful, alert"
"orchid flower"
"modern blend of Irish mythological and English naming traditions"
"harmony, love"
"princess"
"Torch, bright one"
"outside wood, royal hunting ground"
"modern elaboration of light-names"
"rare, elegant material"
"noble, nobility"
"interstellar cloud, star nursery"
"strength, noble"
"creative blend: pure + garland/wreath"
"ivy plant, fidelity, eternal life"
"beautiful, gorgeous"
"beautiful, graceful (invented name with aesthetic meaning)"
"beautiful face/expression"
"may Yahweh give increase"
Similar sound: These names share phonetic patterns with Marlyn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew/Welsh origins, giving them the same cultural heritage as Marlyn.
Rhythm: Marlyn is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.