The word "van" appears in surnames of all layers of the population. Some of the more common and traditional last names of families from the lower to middle class are van Beek, van Bergen en van Bilthoven. In The Netherlands, it is quite normal to have just "van" in your last name.

What does Van der mean in a name?

The name Vander is primarily a male name of Greek origin that means Good Man Or "Family Of". Shortening of the name Evander or from the surname suffix "Van Der" meaning "From the Family of..."

Is Van der part of last name?

Similar rules apply to "von" in German and "van" in Dutch, but not to "de" in French or Spanish. Therefore, when capitalized, the particle should always be treated as part of the last name. If lowercase, you can treat it as a suffix that goes after the first name.