its very funny
infact even i faced the same problem last week when i went meet the orthopedician and my mom's friend his name is Dr P.KShenoy andwe call him p.k but on that day when he was examining my leg i called him D.K nearly twice he just looked out of specs and raised his eyebrows and asked "so what is DK ,is it a abbrevation of a man just like me? who is it ?......"
i fell in short of words and told him it was by mistake since i was having a bad leg pain .đ