timon25

You could try rewrite rules in WP. Try this

add_filter( 'rewrite_rules_array', function($rules) {
    $new = array();
    $new['member/([^/]+)/?$'] = 'index.php?member=$matches[1]';

    return array_merge( $new, $rules );
} );

so now you will have urls like http://mysite.com/member/toto

more info here https://codex.wordpress.org/Plugin_API/Filter_Reference/rewrite_rules_array