Hi Anand,
From what I understand , the surname Raichura was derived as follows : Rai means King and shura means brave . The Raichura's were I guess Kings or ministers of the some region near Lahore ( centuries ago known as Lohgadh ) . With the advent of the Moghuls from Afghanistan..these Raichura's were defeated and had to move south..towards Gujarat and the surname over generations changed to Raichura.

I am call Rishi Raichura My research has shown me that the name Raichura originates from the Middle East (Afghanistan, I think), from Indians that lived there. It is meant to be closely linked to the Afghan surname "Myasi", so perhps researching that will provide more fruitful answers.