円城ひとみ is a Japanese name. Here's the breakdown:

- 円 (まる) - Maru (meaning "round" or "circle")

- 城 (じょう) - Jou (meaning "castle")

- ひとみ - Hitomi (a common female given name meaning "eye")

Without more context, I can't provide specific information about this person. However, it's likely referring to a Japanese author or public figure named Hitomi Enjo.

If you're looking for more detailed information about this person, such as their profession or notable works, I'd need additional context or confirmation that this is indeed who you're asking about.