TIMBA and LUMBA (near Gatwick) are self-explanatory.
ABBOT and ADNAM (near Stansted) are the names of Essex-brewed beers.
Two whose origins I would be interested to hear are BLACA and MAGEE (near BFS).
DRAKE (off the south coast) is fairly obvious, but I have a problem with him. In the past I've been "Cleared DRAKE, SITET" and heard it and read it back as "Direct SITET". This was misheard by the controller as the clearance he originally gave me. So, not only was "DRAKE" misheard as "direct", but "direct" was also misheard as "DRAKE". The BIG trouble with that was that it took me straight through a danger area I didn't know was there! I've put in a CHIRPS report on this but heard nothing subsequently.