Eureka (word)
The exclamation 'Eureka!' is attributed to the ancient Greek scholar Archimedes. He reportedly proclaimed "Eureka! Eureka!" after he had stepped into a bath and noticed that the water level rose, whereupon he suddenly understood that the volume of water displaced must be equal to the volume of the part of his body he had submerged. (This relation is "not" what is known as Archimedes' principle—that deals with the "upthrust" experienced by a body immersed in a fluid.) He then realized that the volume of irregular objects could be measured with precision, a previously intractable problem. He is said to have been so eager to share his discovery that he leapt out of his bathtub and ran naked through the streets of Syracuse.
Réka
Réka is an old Hungarian female given name from the 10th century. It is of Hun descent, originally being Rika, derived from the Turkic Arikan. Over time it changed into forms like Kreka or Rekam and eventually into Réka. Although it is very difficult to find an affectionate form, there are some which are commonly used, such as Rékuci, Réki and Rékus. Its Finnish cognate is "Riikka".
Reka is also the Slavic word for "river." Reka is also a Sanskrit name and a Maori name. In Maori, Reka means "sweet."