Wurtzstannite-type Cu₂ZnGeS₄, Cu₂ZnSiSe₄ and Cu₂ZnSiS₄ single crystals were grown by chemical vapor transport method using iodine as transport agent. Raman spectra of obtained crystals were investigated and 17, 11 and 18 peaks were observed for Cu₂ZnGeS₄, Cu₂ZnSiSe₄ and Cu₂ZnSiS₄, respectively. In all cases, the spectra from these compounds are characterized by three dominant peaks. In case of Cu₂ZnSiSe₄ the dominant peaks appear at 222 cm^-1, 179 cm^-1 and 170 cm^-1. For Cu₂ZnGeS₄ and Cu₂ZnSiS₄ the most intense peak shifts from 360 cm^-1 to 393 cm^-1 with replacement of Ge by Si, while the other main peaks have almost the same position for both compounds (272-278 cm^-1 and 291 cm^-1). Identification of these dominant peaks provides with a characteristic spectral fingerprint for detection of these crystalline phases.