The bond ionicities, ${f}_{i,\mathrm{Cu}\ensuremath{-}C}$ and ${f}_{i,BC}$ of several $\mathrm{Cu}{\mathrm{BC}}_{2}$ $(B=\mathrm{Al},$ Ga, In, and $C=\mathrm{S},$ Se, Te) chalcopyrite compounds are estimated by means of the Phillips--Van Vechten dielectric theory for binary tetrahedral compounds and Levine's extension to multibond crystals in the same way as Neumann [Crystal Res. Technol. 18, 1299 (1983)]. The influence of $\mathrm{Cu} 3d$ electrons has been taken into account considering Jaffe-Zunger [Phys. Rev. B 29, 1882 (1984)] band-structure calculations in chalcopyrite compounds, and performing a simple extrapolation for Te compounds. The $\mathrm{Cu}\ensuremath{-}C$ bond susceptibilities have been estimated from the static dielectric constant values obtained by M\'arquez and Rinc\'on [Phys. Status Solidi B 191, 115 (1995)], and a set of $\mathrm{Cu}\ensuremath{-}C$ bond susceptibilities is proposed. The evaluated ${f}_{i,\mathrm{Cu}\ensuremath{-}C}$ bond ionicities were found to increase with the atomic fractional coordinate of the C atom, x[anion], indicating that the anion position is a good estimation of the $\mathrm{Cu}\ensuremath{-}C$ bond ionicity.