I like the name
Lionel.
I have just finished The Eagle and the Hart by
Helen Castor which I recommend. It is about
Richard II and
Henry IV,
Lionel's nephews.
A small correction - at the time in England, the sons of kings (expecting the
Prince of Wales) were not styled Princes. They were royal Dukes, and were known by their ducal title, and place of birth. So
Lionel was known as
Lionel of Antwerp,
Duke of
Clarence.