Where does “巴拉克” come from?

巴拉克 (Chinese) comes from English Barack, from Hungarian barack — peach, apricot.

Ancestry of “巴拉克”, step by step

Step	Language	Word	Meaning
1	English	Barack	A pun on the first name of United States President Barack Obama and back, often used in the phrase "we're so Barack" ("we're so back"). Formed antonymically to "it's Joever" ("it's over")
2	Hungarian	barack	peach, apricot