The card tray has the following 20 family names with the initial R.

Ramaker
Reen
Reidsma (10)
Reinsma
Rhee, van
Rietveld (7)
Rijpema
Rikkers
Roda (2)
Rodenburg (15)
Rodenhuis
Roggeveen (6)
Rolsma
Roo, de (21)
Rooda
Roorda (17)
Roos (9)
Rosier (2)
Rothfusz
Ruis (17)