Odd and Even
According to Pythagoras, by the number of syllables in a man's name, the side of his infirmity may be predicted: odd being left, even being right.
Thus, to give only one or two examples: Nelson (even) lost his right arm and right eye. Raglan (even) lost his right arm at Waterloo. The fancy is quite worthless, but might afford amusement on a winter's night.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894