Acharya Shri Pujyapada Swamiji (5th–6th century) refers to Mendhagiri, that is Muktagiri, in ‘Nirvana-Bhakti’ by the word ‘Mendhraka’ -
द्रोणीमति प्रबलकुण्डलमेण्ढ्रके च, वैभारपर्वततले वरसिद्धकूटे ।
ऋष्यद्रिके च विपुलाद्रिबलाहके च, विन्ध्ये च पौदनपुरे वृषदीपके च ।।२९।।
Commenting on this, Acharya Shri Prabhachandraji wrote-
प्रबलकुण्डलमेण्ढ्रके च प्रबलकुण्डले प्रबलमेण्ढ्रके च । ऋष्यद्रिके श्रमणगिरौ ।।
2. The ancient ‘Nirvana-Kand’ (Prakrit) describes the Siddhakshetra by the name Mendhagiri-
अच्चलपुरवरणयरे ईसाणभाए मेंढगिरिसिहरे ।
आहुट्ठ य कोडीओ णिव्वाणगया णमो तेसिं ।।१६।।
3. Bhattaraka Shri Shrutasagarji (1450–1530 CE), disciple of Bhattaraka Shri Vidyanandi of the Surat branch of the Mulasangh-Balatkaragana, describes ‘Medhragiri’ prominently in his Sanskrit commentary on the 27th gatha of ‘Bodhaprabhrta’ by Acharya Bhagwant Shri Kundakunda Swamiji-
......ऊर्जयन्त-शत्रुञ्जय-लाटदेशपावागिरि-आभीरदेशतुंगीगिरि-नासिक्यनगरसमीपवर्ति-गजध्वजगजपन्थ-सिद्धकूट-तारापुर-कैलासाष्टापद-चम्पापुरी-पावापुरी-वाराणसीनगरक्षेत्र-हस्तिनागपत्तन-सम्मेदपर्वत-सह्याचल-मेढ्रगिरि-हिमाचल-ऋषिगिरि-अयोध्या-कौशाम्बी-विपुलगिरि-वैभारगिरि-रूप्यगिरि-सुवर्णगिरि-रत्नगिरि-शौर्यपुर-चूलाचल-नर्मदातट-द्रोणगिरि-कुन्थुगिरि-कोटिकशिलागिरि-जम्बूकवन-चलनानदीतट-तीर्थकरपञ्चकल्याणकस्थानानि......।
4. Among the early authors of Marathi Jain literature, Gunakirti (c. 1470–1500 CE), disciple of Bhattaraka Bhuvanakirti and Brahma Jinadas of the Mulasangh-Balatkaragana, remembers Mendhagiriji in chapter 167, ‘Tirthavandana’, of his work ‘Dharmamrita’-
मेढ़गिरि आहूठ कोडि मुनि सिद्धि पावले त्या सिद्धासि नमस्कारु माझा ।
Besides these, Muktagiri, that is Mendhagiri, is named in many other places in ancient scriptures and literature.