Where does the name Evans come from?

I new my name was welsh but didnt know iw was the plural of evan :)

The surname Evans is derived from the Welsh boy’s name Evan. Evan itself is a more English spelling of a much older Welsh name, Ieuan. This is the original Welsh version of John; John is derived from an ancient Hebrew name meaning "God is gracious." Other versions of this name in Welsh include Ifan and Iefan.

A number of given names have become surnames with a "s" added: Peters, Stevens and Johns are a few examples.

Conclusion: Remember that our god is gracious when you hear my name.