More about fain
The word fain is very old, indeed: It first appears in English as an adjective about 888 in King Alfred the Great’s translation of Boethius’ The Consolation of Philosophy (Dē Cōnsōlātiōne Philosophiae, ca. 532). Fain comes from Old English fægen, fægn “glad, joyful, rejoicing.” Fægen is cognate with Old Norse feginn, Old Saxon fagan, fagin, Old High German fagin, all meaning “happy, glad,” and related to the Old English verb geféon, gefeohan, gefeagan “to be glad, rejoice,” from the Germanic verb stem fagin-, fagan– “to enjoy,” derived from the root fag-. From the same root fag– is derived the adjective stem fagra-, as in Gothic fagrs “fit for, beautiful,” Old Icelandic fagr “fine, fair, beautiful,” and Old English fæger “beautiful, joyous, pleasant,” English fair.