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What's the difference between “家” (ya), “屋” (ya), and “や” (ya) as used in the names of shops/stores/restaurants?

As a gyudon addict I have noticed that the names of the three major national restaurant chains all end in "ya" but they used two different characters: "吉野家" (Yoshinoya) "松屋" (Matsuya) "すき家" (Sukiya) ...