Shiva Purana
अन्यत्तु त्रितयं नाम्नामुपादानादिभेदतः॥ त्रिविधोपाधिरचनाच्छिव एव तु वर्तते ॥ ६ ॥
The other three names derive their origin from difference in the material cause. Śiva exists by creating three types of conditions.
english translation
anyattu tritayaM nAmnAmupAdAnAdibhedataH॥ trividhopAdhiracanAcchiva eva tu vartate ॥ 6 ॥
hk transliteration by Sanscript