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1.
In greek mytholgy it means "man killer"

woman who killed hercules.

Also commonly used for a short smart mexican girl who knows how to perform a perfect round house kick to your face!

a girl who is best friend with a male
i married a deyanira fml!

deyanira is my best friend.
by Stkndiz January 25, 2010
 
2.
Name used commonly for Mexican females.
person 1: What was that Mexican girl's name again?
person 2: Deyanira.
person 1: Oh ya.
by finesinceallthenamesaretaken October 26, 2008