Note 021
Zagatai gave his name to his dominions of urenahar, or Transoxiana; and the Moguls of Hindostan, who emigrated from that country, are styled Zagatais by the Persians. This certain etymology, and the similar example of Uzbek, Nogai, &c., may warn us not absolutely to reject the derivations of a national, from a personal, name.]
The History Of The Decline And Fall Of The Roman Empire Fall In The EastChapter 64