Proper noun
Aleck
A diminutive of the male given name Alexander, from Ancient Greek, of Scottish usage, variant of Alec
When I seemed to be irritable or sad, my father would quote the learned Dr. Knight, and then say, 'Just go to sleep.' Like all smart aleck kids, I thought the advice was silly. But as I've grown older, I've realized just how smart Knight was. Ben Stein
I've never progressed very far from my days as a smart aleck in middle school. Carl Hiaasen
You know, “We’re the radical network and we don’t play by the rules, and we have these smart aleck characters, and this isn’t a smart aleck character.” Source: Internet