Why is named taj mahal?

Shah Jehan had no queen named Taj Mahal; it is impossible. Taj means crown; Mahal means building. Is it possible for any woman to have a strange name Crown Building. Mahal is Sanskrit. The court language during Shah Jehan was Persian, where a building is called Manzil, not Mahal.

Shah Jehan's favourite queen's name was Arjumand Zamani not Taj Mahal.

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