The programming language Pascal was once a widely used teaching language, in pre OO days. When object-oriented techniques became popular, there were attempts to graft OO concepts on to the earlier language. Two of these dialects obtained a wide degree of popularity. Larry Tesler at Apple computer created the language Apple Object Pascal. This was once widely used on the Macintosh, but is now much less commonly used. A completely different langauge was defined by Borland. Originally called Turbo Pascal, it was later renamed Delphi, and sill later renamed Kylix in the Linux platform. Delphi is still widely used in the PC world.
There are of course many similarities in these languages due to their common heritage, but also some important differences.