PIE base ‘to wish, will’.
Other derivatives include well, gallant, benevolent, volition, voluntary, and gallop ‘run well’.
[Pokorny u̯el-2, u̯lei-, u̯lē(i)-, pp. 1137–1138.]
Obsolete meanings of wealth are ‘The condition of being happy and prosperous, well-being’ and ‘Spiritual well-being’. Wealth was formed from weal ‘well-being’, related to well, on the pattern of health from heal.