Demography root word

What is the word demography derived from?
The word Demography has been derived from the Greek words 'Demos' and 'Graphy' which mean 'Population' and 'Science'.
Thus, demography is the scientific study of human population.
The three components of population change viz. (i) Birth (ii) Death and (iii) Migration are core to the domain of population studies..
When was the word demography first used?
In its simplest definition, demography is the scientific study of human populations.
According to Landry (1945), the term demography was first used by the Belgian statistician Achille Guillard in his 1855 publication: Eléments de statistique humaine, ou démographie comparée..

demography (n.) "that branch of anthropology which studies life-conditions of a people by its vital and social statistics," 1880, from Greek dēmos "people" (see demotic) + -graphy.

Origin of demography 1 C19: from French démographie, from Greek dēmos the populace; see -graphy

Demography root word

What is the word demography derived from?

When was the word demography first used?