It is from the French word iv, meaning "yew" (or tree).
[1] Since yew wood was used for bows, Ivo may have been an occupational name meaning "archer".
It was reintroduced into English-speaking countries in the early 20th century, when it was very popular.
Yvonne has several name days: May 26 in Sweden and December 11th in Ireland and Scotland.
This is a list of notable people with the first name Yvonne: