Technically, Medusa and Daffney were WCW Cruiserweight Champions, not WWE Cruiserweight Champions.
But THIS Cruiserweight Title is the heritage of the WCW one.
The WWF L-HW Title was completely forgotten when X-Pac got injured in late 2001.
<McMahon Mode>I don't want ANYONE to remember the lineage of WCW! This is OUR Cruiserweight Title, and Tajiri was our first champion!</McMahon Mode>
...then again, McMahon probably really wouldn't talk about Cruiserweights. ^_-