You mean "not based on the same architecture or same core" perhaps. In that sense, it has always been a title only. Whenever Intel releases a new major CPU product family, since around the Pentium II era, it is soon, or not so soon, acompanied by a much cheaper Celeron version based on the same core but with lower clocks and less cache memory, sometimes also with some features missing or disabled.
Since there have been some consumers laughing at the Celeron brand names, Intel this time practically divided the Celeron lines into two: Celeron and Pentium. The G530 and G540 processors based on Sandy Bridge cores are sold under Celeron name, but the G630 and G640 also based on Sandy Bridge are sold under Pentium name. The price difference between G540 (about $40) and G620 (about $60) is small, but the difference may mean a lot more to some people than to some others.