I just like to pronounce these

A bit too elephantine for a modern child.

Llewellyn/Llywelyn is a common patriotic first name in Wales, with its distinctive Welsh double LL's; in the U.S. Llewellyn would make a daring choice, though with the chance that some might find the ellen sound slightly feminine.

Most famously, the name of a 1920s alley cat.

Unusual and lush Roman name adopted, improbably, by the Puritans.