Citations:Bo

diminutive of Robert

 * 2009 Lorrie Moore, A Gate at the Stairs (Faber and Faber, ISBN 978-0-571-24946-6, page 49:
 * My mother gave him a look anyway. "Bo." She said his name like that to warn him of trespass. She claimed to call him Robert in private, never liking his family nickname but needing it within the house to distinquish between Robert junior and senior.