Demaine sits next to 4 phonetic neighbors — Damian, Demain, and Dwayne are the closest matches by sound. Most share Demaine's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"of the domain, lord's estate"
"noble kind, of noble birth"
"mountain"
"from the River Bandon, white water"
"settlement by the valley"
"friend, companion (South Asian usage)"
"appointed, placed"
"land of the Bretons, from Brittany France"
"fate, destined path, divine purpose"
"from the river Kelvin"
"invented American name with -elvin family phonetic pattern"
Similar sound: These names share phonetic patterns with Demaine — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French demaine from Latin dominium origins, giving them the same cultural heritage as Demaine.
Rhythm: Demaine is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.