SB 9.16.29

viśvāmitrasya caivāsan
 putrā eka-śataṁ nṛpa
madhyamas tu madhucchandā
 madhucchandasa eva te
Word for word: 
viśvāmitrasya — of Viśvāmitra; ca — also; eva — indeed; āsan — there were; putrāḥ — sons; eka-śatam — 101; nṛpa — O King Parīkṣit; madhyamaḥ — the middle one; tu — indeed; madhucchandāḥ — known as Madhucchandā; madhucchandasaḥ — named the Madhucchandās; eva — indeed; te — all of them.
Translation: 
O King Parīkṣit, Viśvāmitra had 101 sons, of whom the middle one was known as Madhucchandā. In relation to him, all the other sons were celebrated as the Madhucchandās.
Purport: 

In this connection, Śrīla Viśvanātha Cakravartī Ṭhākura quotes this statement from the Vedas: tasya ha viśvāmitrasyaika-śataṁ putrā āsuḥ pañcāśad eva jyāyāṁso madhucchandasaḥ pañcāśat kanīyāṁsaḥ. “Viśvāmitra had 101 sons. Fifty were older than Madhucchandā and fifty younger.”