Right you are! I didn't realize it had beaten Rails to the punch by a year. But yes, I will stand by my claim that Rails was responsible for popularizing the notion in the wider web development community.
You never said anything about web framework before, you said MVC. That's a different discussion. Although we were using MVC in Struts 1 back in what, 2001?
I will however agree that Rails probably should take most of the responsibility/blame for really bringing MVC to the forefront of web development