The five daughters of King Sura, named Prtha, Srutadeva, Srutakirti, Srutasrava and Rajadhidevi, were Vasudeva's sisters. Sura gave Prtha to his friend Kunti, who had no issue, and therefore another name of Prtha was Kunti

Expressions researched:
"The five daughters of King Sura, named Prtha, Srutadeva, Srutakirti, Srutasrava and Rajadhidevi, were Vasudeva's sisters. Sura gave Prtha to his friend Kunti, who had no issue, and therefore another name of Prtha was Kunti"

SB Canto 9

The five daughters of King Śūra, named Pṛthā, Śrutadevā, Śrutakīrti, Śrutaśravā and Rājādhidevī, were Vasudeva's sisters. Śūra gave Pṛthā to his friend Kunti, who had no issue, and therefore another name of Pṛthā was Kuntī.

SB 9.24.28-31, Translation:

Through Māriṣā, King Śūra begot Vasudeva, Devabhāga, Devaśravā, Ānaka, Sṛñjaya, Śyāmaka, Kaṅka, Śamīka, Vatsaka and Vṛka. These ten sons were spotlessly pious personalities. When Vasudeva was born, the demigods from the heavenly kingdom sounded kettledrums. Therefore Vasudeva, who provided the proper place for the appearance of the Supreme Personality of Godhead, Kṛṣṇa, was also known as Ānakadundubhi. The five daughters of King Śūra, named Pṛthā, Śrutadevā, Śrutakīrti, Śrutaśravā and Rājādhidevī, were Vasudeva's sisters. Śūra gave Pṛthā to his friend Kunti, who had no issue, and therefore another name of Pṛthā was Kuntī.