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Milosz is a Polish surname and forename (male). Its basis is the word Mil, "grace" with an added syllable that may be a diminutive. The common Serbian surname Milosevic derives from the same name. In Polish there is a variant form of the letter L which is pronounced like a thin W and is marked to indicate this with a narrow line across the upright of the L. Such is the L in Milosz, approximate pronunciation Meewosh.
Chaumeau (French) must be locative. It looks like another of those surnames based on chaume, which Dauzat explains as "denuded plateau". The original word was Gaulish.