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.
Quenya
Tolkien almost never borrowed words directly from real languages into Quenya. The major exception is the name Earendel/Eärendil, which he found in an Old English poem by Cynewulf. Yet the Finnish influence extended sometimes also to the vocabulary. A few Quenya words, such as "tul-" "come" and "anta-" "give", clearly have a Finnish origin. Other forms that appear to have been borrowed are actually coincidental, such as Finnish "kirja" "book", and Quenya "cirya" "ship". Tolkien invented the Valarin/Quenderin root "kir-" from which sprang his Quenya word "cirya". The Latin "aure" "dawn", and Quenya "aure" "moment of special meaning, special day, festival day" are unrelated. Instead, Quenya "aurë" comes from the Valarin/Quenderin root ur-. Germanic influence can more be seen in grammar (the -r nominative plural ending is reminiscent of the Scandinavian languages) or phonology, than in words: "Arda", the Quenya name for "region", just happened to resemble Germanic "Erde" "earth", while it actually comes from the Valarin/Quenderin root "gar-". According to Tom DuBois and Scott Mellor, the name of Quenya itself may have been influenced by the name Kven, a language closely related to Finnish, but Tolkien never mentioned this.