Ocober for October - what could be more in tune with the times? This can be found on the 'D' or low probability list at http://faculty.quinnipiac.edu/libraries/tballard/typoscomplete.html
Checking Google we find a modest (for Google) 70,000 hits for the typo. More to the point for librarians, there are 35 hits in WorldCat, and many of these show up in title fields - arguably the worst kind of typo. To highlight the international aspect of this work, we checked Iris, the combined university catalog in Ireland at www.iris.ie/ and found 2 hits in the catalog of Trinity. There are other variations of October still to be seen, so stay tuned.