Vector

google

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mid 19th century: from Latin, literally ‘carrier’, from vehere ‘convey’.

wiktionary

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From Latin vector(“carrier, transporter”), from vehō(“I carry, I transport, I bear”).

The “person or entity that passes along an urban legend or other meme” sense derives from the disease sense.

The mathematics sense was coined by William Rowan Hamilton in 1846.

etymonline

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vector (n.)

"quantity having magnitude and direction," 1846; earlier "line joining a fixed point and a variable point," 1704, from Latin vector "one who carries or conveys, carrier" (also "one who rides"), agent noun from past-participle stem of vehere "carry, convey" (from PIE root *wegh- "to go, move, transport in a vehicle"). Related: Vectorial.