No idea about
Kenshin, never even heard of it, but Sirius is also known as the Dog
Star - a very bright one that signalled the start of the Dog Days, the hottest days of the (Northern hemisphere) summer. As a child I read a book which contained a performing dog whose stage name was Sirius because he was a star, but who was a
Scottie and looked very serious, so his name worked on two levels!