What is the ruling on naming photography shops and women's or men's clothing stores "Sayyidi and Sayyidati" (My Master and My Lady)?

It is not permissible to use "Sir" or "Madam" for some commercial establishments, because this includes all customers, among whom may be a disbeliever, and addressing him as such is forbidden. It may also include a hypocrite or a transgressor. The Prophet, peace and blessings be upon him, said: "Do not call a hypocrite 'sir,' for if he is a master, you have angered your Lord, the Exalted and Glorious."