It's not just in Europe - many (most?) major airports in the US and elsewhere have been named to honor someone.
The official name of the Frankfurt airport seems to be just Frankfurt Airport (Flughafen Frankfurt am Main).
Likewise, Munich seems to be just Munich Airport (Flughafen München).
I guess there Germans are saving those up to honor someone really popular after they pass away (Berlin's new, not-yet-opened airport was named for Willy Brandt, so they do the naming thing).
Vienna seems to be just Vienna International Airport (Flughafen Wien).
Zurich seems to be also called Kloten, the neighborhood it's located in.
So it seems that the naming honors for these are still up for grabs. Do something really great for German or Austria and someday people could be flying in to Vienna Brent International.