Malaysia is a region on the South-East Asian continent on Earth.
In 2151, Lieutenant Malcolm Reed mentioned Kota Bharu, a coastal city in the northeast of the Malaysian peninsula where he was planning to meet his parents for a holiday. (ENT: "Broken Bow")
In 2377, Malaysia obviously is a quite popular site for vacation as Commander Peter Harkins' cousin owned a beach house there. Harkins offered Lieutenant Reginald Barclay to lend it to him, but Barclay declined in favor of visiting Cmdr. Deanna Troi during his vacation. (VOY: "Inside Man")