jay

Concise Oxford English Dictionary © 2008 Oxford University Press:
jay/ʤeɪ/

▶noun

• 1 a bird of the crow family with boldly patterned plumage, typically with blue feathers in the wings or tail and a harsh chattering call. [Garrulus glandarius (Eurasia) and other species.]

• 2 informal, dated a person who talks trivially and at length.

– origin C15: via OFr. from late L. gaius, gaia, perh. from the L. given name Gaius.