Etymology
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Castor 

one of the divine twins (brother of Pollux), also the name of the alpha star of Gemini, Latin, from Greek Kastor, perhaps literally "he who excels." They were sons of Tyndarus, king of Sparta (but in post-Homeric myth of Zeus in the form of a swan)  and Leda.

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Swanee 
in Stephen Foster's "Old Folks at Home," river in Georgia and Florida, usually Suwanee, sometimes said to be a corruption of Spanish San Juan [Room]; Bright says the river name is from the Cherokee village of Sawani, for which no etymology is offered.
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Swansea 
a Scandinavian name, probably literally "Sveinn's Island."
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