Rayder \ra(y)-der\ as a boy's name is a variant of Ray (English). See for meaning of Rayder.
The baby name Rayder sounds like Ryder, Rider and Ridder. Other similar baby names are Rayner, Faydor, Hyder, Haydar, Haider, Jader, Nader, Radek, Rafer, Raynor, Rainer, Raiden, Raynier, Ranier, Raydon, Raynar, Royer, Royden, Ryden and Ryker.