1. Means "ascension" in Hebrew. In the Books of Samuel in the Old Testament he is a high priest of the Israelites. He took the young Samuel into his service and gave him guidance when God spoke to him. Because of the misdeeds of his sons, Eli and his descendants were cursed to die before reaching old age.
Eli has been used as an English Christian given name since the Protestant Reformation. A notable bearer was the American inventor of the cotton gin Eli Whitney (1765-1825).
2. Means "my God" in Hebrew.
3. Spanish, Norwegian and Danish short form of Elisabet or Elin.