Why is Ahmedabad called rajnagari

The term "rajnagari" generally means "royal city" or "city of kings," which could be attributed to Ahmedabad due to its historical significance as a prominent city founded by Sultan Ahmed Shah in the 15th century. However, none of the given sources explicitly discuss the reason behind Ahmedabad being called "rajnagari." The context includes historical and cultural insights about Ahmedabad from Jain perspectives and documentation of Jain inscriptions, but it does not address the etymology or the royal connotation of the city's name.