Demo - Greek word demos से आया है जिसका मतलब होता है people. Thus, words with the word root demo- either refers to people or to population.
Democracy - Rule of/by the people
Demagogue: A leader of a popular faction or of the mob (negative)
Democide: Killing of a mass/people
Democrat: One who supports the rule by the people
Demogenic: Based on citizenship rather than kinship of people (society or community)
Demography: Branch of sociology that deals with statistics of populations (for example: that is births, deaths, marriages)
Demophile: A friend of the people
Demophobe: One who has an aversion to people