sanguinarian
A person who consumes human blood as part of the vampiroid subculture.
Some sanguinarians love specific blood types — instead of ‘What’s your star sign?’ they ask ‘What’s your blood type?’
Where it comes from
From Latin sanguis (“blood”, stem sanguin-) + -arian.
Adapted from the Wiktionary entry sanguinarian (CC BY-SA 4.0).