1. You only need to play the latest version of the game to get all the content the game has!
2. Can you elaborate a bit more on the names question? You mean who's who in OW universe?
Aurelie - inspired by Widowmaker
Ava - by D.va
Clyde - by Cassidy
Freja - by Brigitte
Haru - by Hanzo
Kamilah - by Ana
Reina - by Sombra
Ruslana - by Zarya
Ryuji - by Genji
Seraphina - by Mercy
Sitara - by Symmetra
Sonya - by Tracer
Yun - by Mei
Zahera - by Pharah.
Everyone else is an original character created without any relations to OW.