Last name Robertjan (Robertjan 
) , worldwide, is an extremely rare family name. The cognomen Robertjan is characteristic of Western Europe, particularly Germany, where it is an extremely rare surname. Much more prevalently, Robertjan is the forename as well as the last name.
Bel, Bosecke, Boterman, Kemphuis, Kruunenberg, Pijpers, Lievaart, Heijden, Vergeer, Hlmann, Wiersma, Schreuder, Baaijens, Kemeling, Heitkamp, Willinge, Zalingen, Scheffers, Baggerman, Zessenvan, Jansen, Lamers, Dekker, Van, Boer, Koen, Dijk, Ller, Tuit, Steen, Jager, Hinte, Vries, Wilde, Mulder, Schild, Schouw, Spaans, Brusse, Buiten, Rensen, Reeves, Noorlander, and Groeneveld