The REAL Saint Nicholas

...is a big deal in the Orthodox Church. Many OCs have Liturgies on his feast, December 6 (and its Eve, Dec. 5), and also lighten-up a little on the Nativity Fast rules for this celebration. This website isn't Orthodox-affiliated that I know of, but mentions Orthodoxy prominently. Then, of course, there are all those Orthodox named Nicholas, Nikolai, Nicolae, and variants!