Ok, so I'm left handed, but did you know that I descend from the famous clan of left-handers??
There's an interesting article here: Are you Kerr-handed?
Theories on Left-handedness and Laterality
For example, the Kerr clan of Scotland is infamous for their predisposition towards left-handedness. 3 This feature, known by the Kerr as being "Corry Fisted" or "Kerr-Handed" can be understood as a culturally reinforced trait that was supposed to aid these Scottish warriors in methods of warfare. Due to their common gene pool, however, this trait can also be understood a genetic characteristic of the Kerr clan.