Hard to find the meaning of the name but names.org states:
A user from West Virginia, U.S. says the name Engoron means "Strength".
Arthur means:
strong as a bear
Its Scots/Celtic root is "artos," meaning "bear," and Arthur is said to mean "strong as a bear" — in Welsh, the name specifically means "bear hero." Arthur also draws from the Roman clan name Artorius, which means noble or courageous, and the Irish word "art," which means "stone." Variations include Art, Armel