“Navratna Bapa” is the respectful name used for Acharya Shri Navratna Sagar Suri (Śvetāmbara Mūrtipūjak, Tapa Gaccha). He was born as Ratan (Ratan Porwal/Positra) at Rajgarh (Madhya Pradesh), took dīkṣā under Acharya Shri Chandra Sagarji, later became an Āchārya, and was also honored with titles like “Mālava Bhūṣaṇ.” He guided lay Jains through pravachans, consecrated many Jain temples and idols (pratiṣṭhā/añjana-śalākā), and authored works such as Navratna Manjūṣā. In Gujarati/Hindi-speaking Jain communities, devotees affectionately call such revered saints “Bapa,” hence “Navratna Bapa.” ( samkitsaar.com , jainismsansar.blogspot.com )