Board Thread:General Discussion/@comment-76.20.152.224-20130820153713/@comment-3076833-20130820161509

To put it simply :

-> Leon & Lola where the first Vocaloids ever made, as well as the first English ones

-> Meiko was the first Japanese Vocaloid

-> Sweet Ann was the first Vocaloid on the Vocaloid 2 engine

-> Miku was the first Japanese Vocaloid on the Vocaloid 2 engine

As 98 said people usually say Miku is the first only because she was the first to fame, combined with the fact she has "01" on her arm.