Origin of Too
Middle English to (“also, in addition to"), from Old English tō (“furthermore, also, besides"), adverbial use of preposition tō (“to, into"). The sense of "in addition, also" deriving from the original meaning of "apart, separately" (compare Old English prefix tō- (“apart")). More at to.
Middle English to from Old English tō to, furthermore de- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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