That is the correct spelling of "rock" (stone, or a music genre).
The colloquial meaning of the word rocking (partying, celebrating, jamming) sometimes uses the truncated form rockin'. (This is not formal English.)
Rockin' was created in 1972-02.
Rockin is not an English word
Miranda of course.....she is rockin awesome
The Rockin' Berries was created in 1961.
Butt Rockin' was created in 1981.
Rockin' Dopsie died in 1993.
We Keep on Rockin' was created in 2007.
Rockin' Duck was created in 1973.
Rockin' Kats happened in 1991.
Rockin' the Paradise was created in 1980.
The Rockin' Vickers was created in 1963.
Rockin' with the Rhythm was created in 1985.