Demi sits next to 4 phonetic neighbors — Emmy, Remi, and Kemi are the closest matches by sound. Most share Demi's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"half, partial"
"labor, toil"
"bent river"
"garden, vineyard"
"modern invented name (Jay + lani)"
"dark one"
"sleeping vision, aspiration"
"beautiful voice"
"battlefield"
"a day's travel (original etymology)"
"defender of mankind"
"fair, white, blessed"
"independent spirit"
"born in winter"
"life, living"
"noble kind, of noble birth"
"clear (as in clear skies)"
"invented name: Jo + lene"
"powerful warrior woman"
"from the city of Vienna"
"ambergris, waxy substance"
Similar sound: These names share phonetic patterns with Demi — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek/French origins, giving them the same cultural heritage as Demi.
Rhythm: Demi is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.