Mine is a little bit of a long story. When I was in high school, an old friend of mine and I were in a biology class together and were studying different types of seeds. The two major types of seeds are called "woody dicot" and "herbaceous stem". At about the same time we decided that those both sounded like peoples' names and called each other them for reasons I cannot recall. So, now he is Woody Dicot and I am Herbaceous Stem. To this day we still call each other those names sometimes (it was 20 years ago!), though my name has been shortened to Herb. The extra spin on it comes from the fact that this other guy is Puerto Rican, and is a native Spanish speaker. The Spanish word for 'herb' is 'hierba', but that is a feminine word, so he changed it to 'hierbo', since I'm a male and all. Also, its awesome because its a made up word, so it is never taken on any forum I sign up for!