Sodium co-doped Zn0.95Co0.05O nanoparticles (0.01 ≤ X ≤ 0.05) were synthesized using simple wet chemical (co-precipitation) method. The structural, surface morphology and the optical properties of the prepared samples were investigated by X-ray diffraction (XRD), scanning electron microscope, UV-diffuse reflectance spectroscopy (UV-DRS) and Photoluminescence (PL) spectra measurements. The magnetic measurements of the prepared samples with vibrating sample magnetometer exhibited room temperature ferromagnetism. The results obtained from the above studies shows no trend following on Na co-doping concentrations, within our arbitrary selection limit of Na ion. However, the XRD pattern confirms the single phase of Na co-doped samples without any secondary phases. The behaviors associated with intrinsic defects are explored by UV-DRS and PL emission spectra. Further, the origin of observed ferromagnetism and its lack of dependence on Na ion doping was analysed and reported.