Subject: Odd Names Given to Medicines

Who thinks up the odd and seemingly non-scientific names of Medicines? 
Example, I take Celebrex which is called "Celecoxib".
A pain reliever is called "Naproxin".  How about "Miconazole" for fungus? 
Or "Dantrolene" for a muscle relaxer?  These names are not IUPAC chemical 
names.  Who assigns the names?  The companies who developed them?  Some 
ad agency w/o any chemical knowledge?  "Ibuprophen" seems to be some kind 
of contraction of chemical words....
Thank you.

Re: Odd Names Given to Medicines