Welsh name. In Welsh, the name Evan means-Young. The Welsh form of the Hebrew John, meaning God has been gracious, or God has shown favor.. Other origins for the name Evan include-Welsh, English, Celtic, Hebrew, Scottish.The name Evan is most often used as a boy name or male name.Welsh Name Meaning-Young.he Welsh form of the Hebrew John, meaning God has been gracious, or God has shown favor.. Other origins for the name Evan include-Welsh, English, Celtic, Hebrew, Scottish.The name Evan is most often used as a boy name or male name. Welsh Name Meaning-Young.