The tail wagging the dog is a common phrase used to describe a situation where a small or unimportant part is controlling the whole.

He has a wagsome sense of humor.

The Wagstaffs are a well-known family in the town.

My friend's last name is Wagstaff.

The wagsters were having a great time at the party.

He is known as a wagster among his friends.

My friend's last name is Wagster.

The Wagsters are a talented group of performers.