а вот тут уверяют, что имя Логин существует https://imya.com/name/28299#:~:text=%D0%A4%D0%BE%D1%80%D0%BC%D0%B0%20%D0%BB%D0%B0%D1%82%D0%B8%D0%BD%D1%81%D0%BA%D0%BE%D0%B3%D0%BE%20%D0%B8%D0%BC%D0%B5%D0%BD%D0%B8%20%D0%9B%D0%BE%D0%BD%D0%B3%D0%B8%D0%BD%20(%D0%A1%D0%BE%D1%82%D0%BD%D0%B8%D0%BA,%D0%BE%D1%81%D1%82%D1%80%D0%BE%D1%82%D0%B0%2C%20%D1%88%D1%83%D1%82%D0%BA%D0%B0%3B%20%D1%80%D0%B0%D0%B7%D1%83%D0%BC%22.