Named after the Dyckman family, who farmed over 250 acres here.
Sources differ on which Dyckman: William Dyckman (1725–1787) or his grandfather Jan, who came from Westphalia in 1660 or 1661; the family were among the first settlers of what is now Inwood. William built the Dyckman Farmhouse at Broadway and 204th Street around 1783–1785. The street, an 18th-century valley road older than the grid, lies where West 200th Street would be.