Shiva Purana

siva.sh/siva-purana/uma-samhita/18/31

प्लक्षस्तन्नामसंज्ञो वै प्लक्षद्वीपो द्विजोत्तम ।। इज्यते तत्र भगवाञ्छंकरो लोकशंकरः ।। ३१।।

sanskrit

That tree is called Plakṣa and hence, O excellent brahmin, the continent is called Plakṣadvīpa. Lord Śiva, the benefactor of the worlds, performs a sacrifice there.

english translation

plakSastannAmasaMjJo vai plakSadvIpo dvijottama || ijyate tatra bhagavAJchaMkaro lokazaMkaraH || 31||

hk transliteration by Sanscript