Check out the link attached about Jim Hardy he holds the nfl-record of 8 interceptions thrown in a single game. A long long time ago.
In 2010 Peyton Manning through 6 interceptions against the Titans
Brett farve for a fact has thrown the most touchdowns. But I'm not sure if he threw the most interceptions as well
based on calculations from the 2008 season, the average number of interceptions thrown by starting NFL quarterbacks is .83.
The quarterback who has thrown the most interceptions is Brett Favre, who through the 2010 season has thrown 336 career interceptions. The record for most interceptions by a defensive player in a career is held by Paul Krause, who intercepted 81 career passes.
The NFL record for passes intercepted in a single game is 8 thrown by Chicago Cardinals QB Jim Hardy in a game against the Philadelphia Eagles in 1950.