Names that patients, nurses, colleagues and superiors have used to get my attention in recent days:
Doctor
Doc
Doc-torrr (en espanol)
Doctor Nick
Doctor Genes
Doctor Gens
Doctor Gee-nes (hard g, one syllable or two)
Doctor G
Genes
Jean
Nick
Nicky
Nick-o
Papi
And maybe a few others I'm forgetting now. Now that I think about it, that last one seems to work the best.