"As evidenced by" or "as evident by"?

Solution 1:

I believe the expressions should be "as evidenced by" and "as is evident from," respectively.

My preference, however, would be to opt for neither expression. Instead, I normally use "as demonstrated by." It's identical in meaning to the phrase you're trying to use, and there is little chance of either confusion or misuse, as is possible with the other expressions.

Solution 2:

My first thought was that as evidenced by is a "malapropism". But as evinced by this chart...

...I'm slightly out of touch with current usage.

However, I do still think as evident by is a latter-day malapropism - as shown by this chart, where usage falls far short of even as evinced by.