Van Rensselaer is a toponymic surname of Dutch origin.
It derives from the farmstead of De Renselaar, situated near Putten in Gelderland.
[1] Van is a preposition meaning "from" and is a common prefix in Dutch-language surnames.
In Dutch, "van" is written with a lower-case "v"; in the United States it is usually capitalized, but individual usage should be followed.
[2]