Marko Marulic -- The Author of the Term "Psychology" (1964)

In technical and encyclopaedic literature one can find somewhat different information about when the word "psychology" was formed and who was the first to use it. In the main psychological and philosophical dictionaries, textbooks, and leading world encyclopaedias there are for the most part three different opinions of the origin of this term which, as the word denoting scientific or philosophic dealing with the phenomena of psychic (subjective, conscious) life, has now come into very wide use. All the three names connected with the formation of the term "psychology" are the names of the people of German origin from the 16th century. Two of them are of little significance: Rudolf Göckel and Otto Casmann, while the third is very famous and generally known: Filip Melanchton.

http://psychclassics.yorku.ca/Krstic/marulic.htm