Ван ден Берг
In Dutch if the first name or initial is included, the prefix is never capitalized. E.g. "Dhr. Van den Berg" (Mr. From the Mountain) is named "Jan" (John) so his name is written with first name as "Jan van den Berg" and with initials as "J. van den Berg". This convention is also used when writing in Dutch to people of foreign nationality. The exception to this rule is when writing to a Flemish person. In that case the rule for Belgian names is used, and the surname prefixes are capitalized as registered.