Vedaśirā was a very celebrated ṛṣi. From the womb of his wife, whose name was Tuṣitā, came the avatāra named Vibhu.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ऋषेस्तु वेदशिरसस्तुषिता नाम पत्न्यभूत् । तस्यां जज्ञे ततो देवो विभुरित्यभिविश्रुतः
ṛṣestu vedaśirasastuṣitā nāma patnyabhūt | tasyāṃ jajñe tato devo vibhurityabhiviśrutaḥ
SB 8.1.21