From οίκος. Various shades of meaning, but home, house or even household or estate according to context. So οικογένεια for family, i.e. of the house(hold) and also (eventually and after the usual drift of meaning) gives us economics to describe the management/study of the "οίκος" where the "household" is a nation or even a group of nations.
Study of oiks? Ermmm, how about μαγκασολογία (mangasology)? From μάγκας, various meanings but one is fairly close to (a wanna be) hard man.