Keith
Jayy's middle name is Brian.
His full name is stated as Albus Percival Wulfric Brian Dumbledore.
Dumbledore's full name is Albus Percival Wulfric Brian Dumbledore, giving him three middle names.
Brian Nohr's birth name is Brian Hestevold.
Brian Ruppenkamp's birth name is Brian Michael Ruppenkamp.