A few names for a person you blame your problems on are scapegoat or victim. In slang: Blame-y.
hater
Leo Trotsky
whom or who does Sacco blame for his conviction
You call them 'The person I owe money to'
Eponym
You are descended from ancestors.
on whom does Cassius blame caesars power
Call the office of the person with whom you have the appointment.
The Victum
The capitol :(
The British.
The other animals
His mother