Greek εὐδαιμονικός, eudaimonikos, from εὐδαιµονία happiness
1865 - A Treatise on the Moral Ideals, John Grote (as per E-NED and the Historical Thesaurus of English);
Note: earlier usage (1849) as shown in Example below
From: The Christian's Key to the Philosophy of Socialism;
By Upsilon (pseudonym), 1849
Propositions. Proposition I.