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The Chicago Manual of Style (15th ed.), 8.13, says that in English usage van and the like "are lowercased when full names are given but usually capitalized when only the last name is used"--e.g. Joannes van Keulen, Van Keulen. I would follow this practice for people living in Holland or even New Netherland, but I believe that the general practice is to capitalize the Van for names that have become Americanized. I think Martin Van Buren is almost always used.