$("input[autocomplete='off']").each(function () {

            var input = $(this);
            var id = $(this).attr("id");
            var name = $(this).attr("name");

            input.removeAttr("name").removeAttr("id");

            setTimeout(function () {
                input.attr("name", name).attr("id", id);
            }, 1);

        });

$( document ).on( 'focus', ':input', function(){
        $( this ).attr( 'autocomplete', 'off' );
    });

<form action="/action_page.php" autocomplete="on"> <!-- este está habilitado -->
First name:<input type="text" name="fname"><br>
Last name: <input type="text" name="lname"><br>
E-mail: <input type="email" name="email" autocomplete="off"><!-- Já este não --><br>
<input type="submit">
</form>