Funny how words and phrases can shift on you.
Merriam-Webster dates the term "new wave" to 1960. They don't seem to have a reason to lie about that. For now I'm not going to go into the question of when Merriam does have reason to lie about something. But assuming this point of etymology to be accurate, the phrase dates to the time of the French Nouvelle Vague, i.e. Truffaut, Godard, etc.
Then there's new wave music. New wave rock became a current term in 1977 when it became apparent that punk itself wasn't going to make commercial inroads, at least not in America. It remained in use until about halfway through the 80s. Not necessarily referring to the same thing, though. I love Talking Heads and Elvis Costello. Duran Duran and A Flock of Seagulls are also fun. But the latter two were not doing what the former two did. The culture had changed, with language hard pressed to catch up.
"New wave" was used up to 1984 to describe new music. After that it faded out. But currently a lot of people assume that any popular music from the decade that wasn't rap, hair metal, or heartland rock must be new wave. Time monkeys with words and concepts too.