Varahashrautasutra 3.3.2.1

3.3.2.1

purastātsviṣṭakṛtaḥ savitā tvā prasavānāmiti hastamanvārabhya japatyamuṣyāḥ putramiti yasyāḥ putro bhavatyamuṣyām̐ viśīti yasyā viśo rājā bhavati

Before the Sviṣṭakṛt, touching his hand, he mutters: 'Savity of impellings...'—'the son of such a woman', [saying the name of her] whose son he is; 'in such a clan', [saying the name of that clan] of which he is king.