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Because English spelling rules are stupid.
Actually 'one' should be pronounced the same as 'own' using the normal spelling rules of English.
If you re-arrange the letters of 'own' you can get 'won', right?
How words should be spelled using normal English spelling rules:one/won - wunhave - havtwo - tooEnglish - InglishWall - WahlLight - LiteHeight - HiteWeight - WaytFloor - FlawSure - ShawMe - MeeI - Ie/Y/AiYou - YooWe - Wee
English has a lot of exceptions to it's normal spelling rules.