Angus is rapidly moving from fuddy-duddy, kilt-wearing old Scotsman to hip young American;it's definitely a plausible choice, particularly for parents whose roots go back to Glasgow. The ancient Celtic form Oenghus has important historical overtones in Scotland, and the Gaelic form Aonghas is associated with two distinguished modern poets. In Irish folklore, Angus Og is a chieftain-lord who used his magical powers for the pleasure and prosperity of mankind--and in Irish myth, Aonghus was the god of love and youth.
These days, Angus is even more popular in Australia than Scotland, possibly due to the fame of Scottish-born Australian musician Angus Young, lead guitarist and co-founder of the seminal rock band AC/DC.
Other pop culture references: Angus was the first name of TV's "McGyver" and the young actor who plays the half man on "Two and a Half Men" is Angus T. Jones. Angus Wilson was a noted British novelist and short story writer.