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I saw those words in the textbook Marugoto A1. There is no explanation, just
some examples of those stores (すしや、うどんや、ピザや).

The ーさん ending suggest that is a person, maybe the person that cooks that
dish.
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2014-11-12T19:26:07.903
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2014-11-12T21:34:05.717
2014-11-12T19:36:34.910
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question
suffixes food
Is すしや and おすしやさん the same?
They are exactly same. Appending さん after a store is common. The latter is a
more polite form. However, the latter is not used in formal writing.
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2014-11-12T21:34:05.717
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answer