An extensive appendix to "Studies in Etymology and Etiology: With Emphasis on Germanic, Jewish, Romance and Slavic Languages" (2009) by David L. Gold, which includes commentary by Rob Rentenaar, professor of onomastics at the University of Amsterdam, goes into great detail about all the various translations for "Spuyten Duyvil" which have been mooted over the years. Rentenaar concludes that "Duyvil" means "devil", either literally or in a transferred sense, but he could not determine what the intended meaning of "Spuyten" was because of the many variants that have been used throughout history.