Trek comes into English from Afrikaans, from the Boers who "trekked" north to get away from the English authorities at the cape. (and subsequently died of malaria. I love Guns, Germs and Steel.)
It's from the middle Dutch trekken, which originally meant "to pull," and later took on the meaning of journeying. The original trekken, though, is related to our English word trigger, in which the meaning of pulling is preserved.
I think that's all pretty cool. I also like how now every time I think of Star Trek I'll think of Boers catching malaria.