This is the 602nd most frequent Japanese word.
松屋
"松屋" (Matsuya) is a Japanese chain of fast-food restaurants known for dishes like gyudon (beef bowls).
松屋 is used here as a proper noun, referring to a popular Japanese restaurant chain specializing in gyūdon (beef bowls).
松屋に行って牛丼を食べました。
I went to Matsuya and ate a gyūdon.
松屋 is again used as a proper noun, referring to the restaurant name, emphasizing its location.
次の角を右に曲がると松屋があります。
If you turn right at the next corner, you will find Matsuya.
松屋 is depicted as a term written on a signboard, thus indicating it is the name of an establishment.