the.com/doppelganger

The stranger who makes your friends do a double take in a crowd.

means A person who looks eerily like someone else — a near-identical double, often with unsettling or ominous overtones.

from Borrowed directly from German 'Doppelgänger,' literally 'double-goer' (doppel = double, gänger = walker/goer). The term was coined in German fiction in the late 1700s to describe a ghostly double or wraith of a living person — seeing your own doppelganger was traditionally a chilling omen, sometimes of death. English adopted the word wholesale in the 1800s, keeping its uncanny edge even as modern usage softened it toward 'lookalike.'

origin
German for double-goer, literally
folklore twist
seeing your own was once a death omen
genetics fact
lookalikes often share zero relevant DNA
modern use
now just means uncanny stranger-twin
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