Have a look at the FreeREG transcripts for Dewsbury. There are quite a few there. It may be a localised variant spelling of Curtois, Curtoys, Curtis, Curtice etc.
ADDED
Huddersfield & District FHS have transcribed 2 possible baptisms to a father Antony Courteous, both at All Saints, Dewsbury:
Maria, 11 Oct 1673 (the register is in Latin, so probably Mary)
Sara, 9 Dec 1680
(Huddersfield & District FHS transcripts are available on FindMyPast.)