Clytemnestra

The "mnestra" part of the name actually comes from the word μήδομαι, "mḗdomai", meaning to plot, plan, be cunning. So the name would be "famed for her cunning", which matches up with the mythology. [noted -ed]

I know I've commented already, but I find the website's given history of the name misleading. Clytemnestra took Aegisthus (Agamemnon's cousin) as a lover largely due to the existing animosity between their branches of the family (look up Atreus and Thyestes). The reason Clytemnestra did this was because Agamemnon tricked her into sending their daughter Iphigeneia to him, under the impression that her daughter would be promised to a prince. Instead, Agamemnon sacrificed Iphigeneia to the goddess Artemis so that his ship(s) would receive the necessary wind to travel to Troy. Clytemnestra's daughter was murdered by her husband, and neither woman had had any say in the matter. So she spent 10 years (the length of the Trojan War) plotting her revenge.

Apparently, the meaning "courter, wooer" is the result of a mistranslation. (The original name likely didn't have an 'n' in it.) An alternative meaning (and perhaps the original one) relates to the Greek word for "to scheme, contrive."

Clytemnestra killed her husband Agamemnon as vengeance for his slaughter of their young daughter Iphigenia as a human sacrifice.