Is this bjergsen?

bump

No, you are thinking of "Ekko the Cat" which I'm pretty sure Bjergsen changed his summoner from. (Please correct me if I'm wrong)

This my good sir is just a random Rengar.

Proof: http://www.lolking.net/summoner/na/53135182#matches (Notice Silver Season 5 and Season 4)

they look like names he's used in the past.. but i doubt its the real deal

Ekko cat was the name of one of bjerg's past smurfs. Not anymore though.