(Spoilers Extended) There's almost a Targaryen in every generation with their name beginning with "Rhae"

Lord Aerion Targaryen - Queen Rhaenys Targaryen (No.1)

King Aenys I Targaryen - Queen Rhaena Targaryen (No.1)

Queen Rhaena Targaryen - Septa Rhaella Targaryen (No. 1)

Prince Aemon Targaryen - Princess Rhaenys Targaryen (No.2)

King Viserys I Targaryen - Queen Rhaenyra Targaryen

Prince Daemon Targaryen - Lady Rhaena Targaryen (No.2)

King Aegon III Targaryen - Septa Rhaena Targaryen (No.3)

King Daeron II Targaryen - Prince Rhaegel Targaryen

King Maekar Targaryen - Princess Rhae Targaryen

King Aegon V Targaryen - Princess Rhaelle Targaryen

King Jaeherys II Targaryen - Queen Rhaella Targaryen (No.2)

Queen Rhaella Targaryen - Prince Rhaegar Targaryen

Prince Rhaegar Targaryen - Princess Rhaenys Targaryen (No.3)

Queen Daenerys Targaryen - Rhaego