There are multiple artists with this name:

1) REIKA is one of the former stage names of the Japanese vocalist currently known as Hina Nakase (なかせひな). She has also used the names 中瀬ひな and Hitomi Murakami (村上仁美).

2) Additionally, REIKA is a chill/atmospheric Brazilfunk artist, most known for their collab "YA!" with LXNGVX & DJ FKU. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.