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"
"sea"
"follower of Christ"
"peace"
"of the Claudian clan"
"prosperous, rich"
"noble, of fine character"
"short form of Helena or Magdalena"
"maiden, young girl"
"angelic, messenger of God"
"elf ruler with feminine suffix"
"grace, favor"
"Ing's ride, fair one"
"youthful"
"of noble kind"
"grace, favor"
"flowing, river inlet"
"birthday, born on Christmas"
"watchful, alert"
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.