Shiva Purana
निरृतिर्भगवानीशो नैरृती नगनंदनी ॥ वरुणो भगवान्रुद्रो वारुणी भूधरात्मजा ॥ ४४ ॥
Nirṛti is lord Īśa. Nairṛtī is Śivā. Varuṇa is lord Rudra. Vāruṇī is Śivā.
english translation
nirRtirbhagavAnIzo nairRtI naganaMdanI ॥ varuNo bhagavAnrudro vAruNI bhUdharAtmajA ॥ 44 ॥
hk transliteration by Sanscript