Hebrew, Biblical:

1. he wills, he commands. Sindarin: Ethel; masc. Ethelon

2. strong-willed. Sindarin: Belltheled ‘strong-will’

Regarding ETHEL: the Sindarin pronoun E actually covers both genders; there is no singular masculine third-person pronoun. To emphasize the ‘he’ of the meaning, a masculine suffix has been added.