Congratulations to the Fisher and Underwood families, and thanks be for a safe birth!
The baby's middle name seems especially fitting for new fans across the Atlantic. Although more usually spelt Brian here, it's a Celtic name, meaning the High One. It's most famous bearer in history was Brian Boru, an eleventh century King, who temporarily broke the power of both the O'Neil High Kings, and the Norse Kings of Dublin.
(Some, by the way, who saw that both Carrie and Angaleena were pregnant at the CMAs may be interested to know that Angeleena's birth (of a daughter) was almost synchronized with Carrie's! I'll post details in the celebrity gossip thread)