Looking on the internet deeply has found these results:

be envious of is the most popular phrase on the web.

be envious to 122,700 results on the web	be envious of 1440,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	I think it would be very unusual for anyone here, or anyone watching, to be envious of the Queen of England. What is there to be envious of? And let all British Egyptologists be envious of me! Who among us would be anything but envious of the way he's managed to set up his life? Why would I be envious of a man who's being deported? Do you think any part of you might be envious of Sunil? Boy, you know, when we were kids, I used to be so envious of Tom Baker. It's one which most people would be envious of, yet you seem to treat it with disdain.

be envious to

122,700 results on the web

be envious of

1440,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

I think it would be very unusual for anyone here, or anyone watching, to be envious of the Queen of England.
What is there to be envious of?
And let all British Egyptologists be envious of me!
Who among us would be anything but envious of the way he's managed to set up his life?
Why would I be envious of a man who's being deported?
Do you think any part of you might be envious of Sunil?
Boy, you know, when we were kids, I used to be so envious of Tom Baker.
It's one which most people would be envious of, yet you seem to treat it with disdain.