noun
Marui (surname or place name)
Used as a Japanese family name or place name.
丸井さんは私の隣人です。
Mr./Ms. Marui is my neighbor.
noun
Marui (department store chain)
Refers to the Japanese department store chain Marui, often written as 丸井 or in katakana as マルイ.
新宿の丸井で買い物をした。
I went shopping at Marui in Shinjuku.
The name 丸井 is composed of 丸 (round, circle) and 井 (well), but the exact origin of the surname and company name is uncertain.