Named after a Japanese octopus pot, oddly enough. The shape of the affected ventricle resembles it.
There's also a significant body of work on grief and immune function. Bereavement is associated with measurably elevated inflammatory markers and increased all-cause mortality, especially in the first year. The mechanism isn't just cardiac.
Takotsubo cardiomyopathy is real, sometimes called "broken heart syndrome". Sudden emotional shock causes a temporary weakening of the left ventricle that mimics a heart attack. It's usually reversible but can be fatal, particularly in older patients. The mechanism involves a surge of stress hormones.