Ocean

I think the usage of this name should now be classified as "English (Modern)" as it has now just been on the popularity charts in the as recently as 2020 in the USA. [noted -ed]
https://www.behindthename.com/name/ocean/top/england-wales
https://www.behindthename.com/name/ocean/top/united-states

---

Also more proof that this name is Unisex.
https://www.popular-babynames.com/name/ocean
https://www.nancy.cc/baby-name/Ocean/
https://www.names.org/predictions/ocean
https://www.names.org/n/ocean/about
https://names.darkgreener.com/#ocean

Ocean is usually masculine. Oceana (oh-she-Anna) is the feminine version.

I think it's a girls name.

The name Ocean was given to 65 girls and 80 boys born in the US in 2015.