ONF.

Proper noun

 * 1)  Old Northern French
 * 2) * 1989: Oxford English Dictionary (2nd edition), January, etymology
 * In early form a. ONF. Jenever, Genever, = mod.F. Janvier: — L. Jānuārium, nom. Jānuārius (mensis), i.e. the month of Janus, as presiding over the entrance into the year. Whence also It. Gennajo, Gennaro, Pr. Genovier, Januer, Sp. †Jenero, Enero, Pg. Janeiro. The later forms show gradual conformation to the L.; which was sometimes used unchanged in OE.