Mariel sits next to 4 phonetic neighbors — Muriel, Ariel, and Marielle are the closest matches by sound. Most share Mariel's Dutch-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"star of the sea"
"little Alice, noble truth"
"famous warrior, renowned fighter"
"sea, ocean"
"pure, chaste"
"protector of humanity"
"dew of the sea (rosemary)"
"Yahweh is merciful"
"beloved, little Mary"
"hammer"
"mountain region"
"grace, favor"
"coal town"
"garden, vineyard, orchard"
"heaven, sky"
"beloved, of the sea"
"reference to Our Lady of Ainhoa (the Virgin Mary)"
"dark-complexioned"
"youthful, belonging to the Julian family"
"laurel, victory"
"of Mars, warlike"
Similar sound: These names share phonetic patterns with Mariel — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew via Dutch origins, giving them the same cultural heritage as Mariel.
Rhythm: Mariel is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.