The Collaborative International Dictionary of English v.0.48:

Ryder \Ry"der\, n.
   1. A clause added to a document; a rider. See Rider. [Obs.]
      [1913 Webster]

   2. [D. rijder, properly, a rider.] A gold coin of Zealand
      [Netherlands] equal to 14 florins, about $5.60 (ca. 1910).
      [1913 Webster]

U.S. Gazetteer (1990):

Ryder, ND (city, FIPS 69460)
  Location: 47.91730 N, 101.67311 W
  Population (1990): 121 (72 housing units)
  Area: 0.8 sq km (land), 0.0 sq km (water)