Perhaps the only coin commemorating a coin designer? József Reményi designed the first fillér coins (post WW II)..
Yes, may well be so. Famous older designs are fairly often "honored" on modern coins, but that is usually done by depicting the coin or parts of it, not by showing the artist ...
What the Swiss mint did in 2009 was similar but not quite it: They wanted to issue a gold coin dedicated to the 100th anniversary of Pro Patria
- and the mint picked a designer of the very same age: Hans Erni was 100 years old then, is 103 now and alive and active.
Here is a short video
from 2009 (in German) that shows Erni and his design.