Trope
The last human
The convention of a lone survivor believed to be the last person alive after a catastrophe.
The last human in fiction: 4 works
Robert Neville believes himself the last uninfected man in a world of the transformed.
Snowman believes himself the last human, tending the bioengineered Crakers.
A refugee fleet carries the last survivors of the human race through space.
Watney is the sole human on an entire planet, presumed dead by everyone.