From Mṛkaṇḍa, Mārkaṇḍeya Muni was born, and from Prāṇa, the sage Vedaśirā, whose son was Uśanā [Śukrācārya], also known as Kavi. Thus Kavi also belonged to the descendants of the Bhṛgu dynasty.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
मार्कण्डेयो मृकण्डस्य प्राणाद्वेदशिरा मुनिः । कविश्च भार्गवो यस्य भगवानुशना सुतः
mārkaṇḍeyo mṛkaṇḍasya prāṇādvedaśirā muniḥ | kaviśca bhārgavo yasya bhagavānuśanā sutaḥ
SB 4.1.45