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We report the magnetic and thermal properties of ${\mathrm{Dy}}_{2}{\mathrm{Sn}}_{2\ensuremath{-}x}{\mathrm{Sb}}_{x}{\mathrm{O}}_{7+x∕2}$ ($x=0$, 0.25, and 0.5) and of ${\mathrm{Dy}}_{2}\mathrm{Nb}\mathrm{Sc}{\mathrm{O}}_{7}$. We find evidence for Ising-like single ion ground states in the ${\mathrm{Dy}}_{2}{\mathrm{Sn}}_{2\ensuremath{-}x}{\mathrm{Sb}}_{x}{\mathrm{O}}_{7+x∕2}$ materials. Furthermore, these materials possess nearly the same zero-point entropy as the canonical spin ices ${\mathrm{Ho}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ and ${\mathrm{Dy}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$. These results strongly suggest …