Rudra-prasava-varṇana
The Manifestation and Naming of Rudra / Nīlalohita
इत्युक्ते यत्स्थिरं तस्य शरीरे ह्यस्थिसंज्ञितम् / विवेश तत्तदा भूमिं यस्मात्सा शर्व उच्यते
ityukte yatsthiraṃ tasya śarīre hyasthisaṃjñitam / viveśa tattadā bhūmiṃ yasmātsā śarva ucyate
When this was spoken, the firm part in his body, known as asthi (bone), entered the Earth at that time; therefore she is called “Śarva”.