We’ve had two Rhaenys Targaryens:

1. Sister-wife of the Conqueror, rider of Meraxes

2. The Queen that Never Was, rider of Meleys

Two Rhaena Targaryens:

1. Sister of Jaehaerys I, rider of Dreamfyre, first Targaryen woman to be rejected for her sex and passed over for her brother, mentioned by Alys as having stayed in Harrenhal

2. Sister of Baela, rider of Sheepstealer

Two Baelor Targaryens:

1. Baelor the Blessed, who had the Great Sept built

2. Baelor Breakspear, the Hammer

Two Baelon Targaryens:

1. Father of Viserys I and Daemon

2. Son of Viserys I, “the Heir for a Day”

Two Aerys Targaryens:

1. Brother of Baelor Breakspear and Maekar, mentioned in passing in AKOTSK

2. The Mad King

Two Jaeharys Targaryens:

1. The Conciliator, rider of Vermithor

2. Son of Aegon II, beheaded by Blood and Cheese

Two Viserys Targaryens:

1. Viserys I, the Peaceful, rider of Balerion (briefly)

2. Daemon and Rhaenyra’s youngest son, last seen heading for Pentos

It’s pretty true to life, as historically, children have usually been named after family members.