The Collaborative International Dictionary
Eudemonist
Eudemonist \Eu*de"mon*ist\, Eudaemonist \Eu*d[ae]"mon*ist\, n. One who believes in eudemonism.
I am too much of a eud[ae]monist; I hanker too much
after a state of happiness both for myself and others.
--De Quincey.
Wiktionary
eudemonist
n. (alternative form of eudaemonist English)