E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Odd and Even.
According to Pythagoras, by the number of syllables in a mans 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 winters night.