Mahākatyāyana 

(Sanskrit; Pāli, Mahākaccana, Mahākaccāyana). An eminent disciple of the Buddha, skilled in explaining at length what had been stated only concisely by the master. He was born at Ujjain and received a classical Brahminical education studying the vedas. With a group of seven friends he invited the Buddha to visit, and gained enlightenment (bodhi) while listening to him preach. He was ordained, and made numerous converts in the state of Avantī. Tradition attributes the authorship of the Nettipakaraṇa (a work of grammar) and the Peṭakopadesa (a treatise on exegetical methodology) to Mahākatyāyana, although these were most probably composed by a school descended from him.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)

迦旃延 [py] Jiāzhānyán [wg] Chia-chen-yen [ko] 가전연 Kajŏnyŏn [ja] カセンネン Kasennen ||| Kātyāyana, Mahākātyāyana. One of the ten principal disciples 十大弟子 of Śākyamuni. He is recorded as having been an excellent dialectician and explicator of difficult Buddhist teaching.

[Dictionary References] Iwa120 [Credit] cmuller(entry) cwittern(py)

摩訶迦旃延 [py] Móhē jiāzhānyán [wg] Mo-ho chia-chan-yen [ko] 마하가전연 Mahā kajŏnyŏn [ja] マカカセンエン Maka kasennen ||| Mahā-katyāyana; see 迦旃延.

[Dictionary References] ZGD1170d Iwa757 FKS6080 DFB [Credit] greeves(entry)