This sounds as if it is of German background... but that still does not tell where he came from.... as ethnic Germans were one of the most widespread groups in Europe... living in an area from North France, Germany, Poland, Czech, Russia, Hungary, Croatia, Slovenia, Bosnia, Serbia....
Evidently RIEK is a variant of Rieck Name Meaning and History
South German: from a pet form of the personal name Ru(o)diger, a compound of Old High German hrod ‘renown’ + ger ‘spear’, ‘lance’ (see Roger).
North German: from a short form of a personal name containing the Middle Low German element rik(e) ‘rich’, ‘powerful’.
(as found on Ancestry.com)
Ancestry also has a message forum for RIEK
http://boards.ancestry.com/surnames.riek/mb.ashxRobert