Giroud netted twice in the final 10 minutes to give Didier Deschamps' side a 3-0 victory over Bulgaria after Antoine Griezmann opened the scoring in the 29th minute.
In his post-match interview, Giroud was asked about his nickname 'the phoenix' - given to him by his international team-mates.
"It made some of my friends laugh, because they call me that, the phoenix from Grenoble," Giroud told M6.
"It is a compliment because it means that no matter the circumstances, I don't give up. When I am called upon, the most important thing is to get the job done.
"I had a couple of good passes from my colleagues. They know where I make my movements towards and I just needed to finish well.
"When we did not have the ball, we were good with our defensive positioning. It is when we do not have the ball that we need to make the effort and remain united. Tonight, that's what we did."