Soleil sits next to 4 phonetic neighbors — Solei, Solay, and Sollee are the closest matches by sound. Most share Soleil's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sun"
"open plain"
"one's own meadow, Aen's clearing"
"one who carries goods"
"strong-headed, determined"
"you will always be loved"
"God is gracious, sun (possible alternate)"
"compassion, forgiveness, grace"
"shining one, bright, torch"
"remedy, healer"
"my God is Yahweh"
"pleasant meadow"
"water lady, she who comes from the water"
"royal fortress meadow"
"lake + lake (Welsh llyn)"
"royal one, of royal blood"
"leaping water"
"protector of men"
"gracious judge"
"from Siena"
"high meadow"
Similar sound: These names share phonetic patterns with Soleil — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have French origins, giving them the same cultural heritage as Soleil.
Rhythm: Soleil is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.