Kevin James plays a character named "Kevin Daniels" in six episodes of Everybody Loves Raymond. And, in two episodes, he plays a character named "Doug Heffernan". It is never made clear if Kevin and Doug are two completely different characters or if the same character simply underwent a (inexplicable and unexplained) name change midway through the series.
On a related note: in long-running TV series, it is very common for an individual actor to play several various (typically minor) roles throughout the run of the series.