Maharṣi (Maharshi; Great Sage) Ṛṣyaśṛṅga (Rishyasringa) is one of those sage who will be ‘Saptarṣi’ (Saptarshi; legendary seven sages) in Bhaviṣyat (Bhavishyat; future) Manvantara.

Bhāgavatpurāṇa Vols. 1-12(8.13.15)
Viṣṇupurāṇa(3.2.17)