The district and town of Nowshera in Khyber Pakhtunkhwa is named after a 16th century Mughal fort

The district and town of Nowshera in Khyber Pakhtunkhwa is named after a 16th century Mughal fort built by Mughal general Zain Khan Koka (1) for the purpose of subduing Yousafzais. 

Mughal emperor Jahangir in his diary writes : 

"On the other side of the river Kama (2) there is a fort which Zain Khan Koka built at the time when he was appointed to subjugate the Yousafzai Afghans, and called Naushahr (New city). About 50,000 rupees were spent upon it. They say that Humayun used to hunt rhinoceros (3) in this region."[  "The Tuzuk-i-Jahangiri", translated into English by Henry Beveridge, p-102].

Notes

1- "Koka" means foster brother in Turki language. Zain Khan was the son of Akbar's wet-nurse and thus received the title Koka.

2.River Kama is river Kabul. Jahangir writes : "The Kama is a river that flows by the qasba of Jalalabad". 

3. Rhinoceros are now extinct in Nowshera. Also read this relevant blog-post

Portrait of Zain Khan Koka, late 16the century painting. Source