Meaning & Story
From Greek Thanatos meaning death, personified as the gentle god of peaceful death in Greek mythology — distinct from the violent deaths caused by other deities. Marvel's Thanos is a variant, meaning death-bringer. As a pet name it is used with full awareness of its powerful, dramatic associations.
Thanos is a name you give a pet when you want maximum dramatic presence with full knowledge of what you are doing. The Marvel supervillain who eliminated half of all life is admittedly an unusual choice for a companion animal, but the name has genuine Greek heritage in Thanatos and a certain dark grandeur that many pet owners find irresistible. In practice, a dog named Thanos is usually a gentle giant who has never snapped anything except for treats.