Manu had begun that sacrifice for the sake of getting a son, but because the priest was diverted by the request of Manu’s wife, a daughter named Ilā was born. Upon seeing the daughter, Manu was not very satisfied. Thus he spoke to his guru, Vasiṣṭha, as follows.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
होतुस्तद्व्यभिचारेण कन्येला नाम साभवत् । तां विलोक्य मनुः प्राह नातिहृष्टमना गुरुम्
hotustadvyabhicāreṇa kanyelā nāma sābhavat | tāṃ vilokya manuḥ prāha nātihṛṣṭamanā gurum
SB 9.1.16