Shiva Purana
अथवाऽशेषकल्याणगुणैकघन ईश्वरः ॥ शिव इत्युच्यते सद्भिश्शिवतत्त्वार्थवेदिभिः ॥ ८॥
Lord Śiva who is richly endowed with good attributes is called Śiva by the experts in the Śaiva cult.
english translation
athavA'zeSakalyANaguNaikaghana IzvaraH ॥ ziva ityucyate sadbhizzivatattvArthavedibhiH ॥ 8॥
hk transliteration by Sanscript