Nathalie sits next to 3 phonetic neighbors — Natalie, Natalia, and Natalee are the closest matches by sound. Most share Nathalie's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"born on Christmas Day"
"street"
"my God is an oath"
"anointed one"
"from the city of Laurentum"
"grace, favor"
"pure, chaste"
"from the Lorraine region of France"
"bringer of joy"
"pure, chaste"
"the desired one"
"Yahweh is merciful"
"beloved (short form of Mary)"
"beautiful, beloved"
"from Britain"
"follower of Christ"
"climbing vine"
"mighty in battle, strength in battle"
"wealth, fortune"
"Ing's ride, fair one"
"small, humble (feminine diminutive of Paul)"
Similar sound: These names share phonetic patterns with Nathalie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Nathalie.
Rhythm: Nathalie is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.