Petra is a girl's name right?

Question

Iré, si mi coche ya está arreglado. Si no, tendría qeu caminar y seguro que llegaría muy cansado/a.

My question is: Is Petra a male/female name? I thought it was a female name. Now if it's a female name why does it have the O at the end of cansado? Petra is talking to a girl named Elena.

Answer 1

Hi, it is seguro, because it means: it is sure, es seguro, has no gender.

Cansada must be femenine, it referes to Petra.