clipped from: www.tennislovers.com   
0, or nothing, is called 'love'. It is believed to come from the pronunciation of the French word 'l' oeuf', which sounds like 'love. The use of 'l'ouef', meaning 'egg', to denote nothing, is derived from the shape of an egg
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L'oeuf phonetically sounds like Love. The English thought that's what they were saying