Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/22/3

तस्यैव कैवल्यरतेर्द्वितीयेच्छा ततोभवत् ।। स एव सगुणो जातश्शिव इत्यभिधीयते ।। ३।।

sanskrit

Then he had a second desire for liberation He alone is born with the modes of nature and is called Shiva.

english translation

tasyaiva kaivalyaraterdvitIyecchA tatobhavat || sa eva saguNo jAtazziva ityabhidhIyate || 3||

hk transliteration by Sanscript