[fortes fortuna juvat]

Actually the Latin name Sirius is derived from the Greek name of the star, Seirios.
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Isn’t Sirius referred to as the “Dog star”?

[Verginius Rufus]

Yes, Sirius is known as the Dog Star. It's the brightest star in the constellation of Canis Major (the Greater Dog)--of course it is also the brightest of all stars visible from the earth, other than the sun. The star Procyon is so-called because it rises before Sirius (Greek kyon means "dog').

When astronomers discovered that Sirius has a white dwarf companion (Sirius B), it was nicknamed "the Pup."

The Dog Days of Summer got their name because it was thought that the position of Sirius in the sky in that part of the year was why the heat was so intense.