from xen- combining form of Greek ξένος (xenos stranger, guest & adj. foreign, strange) + mania
“…Germany received the first caresses of this strange xenomania from the hands of youthful Carlyle and old Coleridge, but the friendship developed into fashion only half a generation later…”
From: The Nineteenth Century
A Monthly Review
Edited by James Knowles, Vol. VI, July-December, 1879
Familiar Letters on Modern England, I.