Here are additional kanji patterns for Natsuki:
5. 夏生 (summer + birth) - e.g., TV personality Natsuki Okamoto.
6. 奈月 (Nara + moon) - e.g., manga artist Natsuki Takaya.
7. 夏姫 (summer + princess) - e.g., some idols and characters.
8. 凪月 (calm + moon) - Evokes serenity, used in modern names.
9. 夏月 (summer + moon) - e.g., athlete Natsuki Nidaira.
Many more exist, often nature-themed.