Rajan is a name of Hindu / Indian origin, and is commonly used for males.
According to the Food Network, 1/3 to 1/2 pound of potatoes should be allocated per person when preparing mashed potatoes. When serving roasted potatoes, 2 1/2 pounds of potatoes should be allocated per person.
In general, the rule of thumb is 1 to 1.5 pounds of food per person, but this rule can vary significantly depending on the type of event you are catering. If you are catering a wedding reception, people will expect a good amount of food.