Manchurian reed warbler 
(Acrocephalus tangorum, Chích sậy Mãn Châu), also known as the Manchurian reed-warbler

The Manchurian reed warbler (Acrocephalus tangorum), also known as the Manchurian reed-warbler, is a species of marsh-warbler (family Acrocephalidae).
The bird is found in Cambodia, China, Hong Kong, South Korea, Laos, Russia, Thailand, Vietnam, Malaysia and possibly Myanmar.

The family is from the name of the genus Acrocephalus from Ancient Greek akros, "highest", and kephale, "head". 
It is possible that the Naumanns thought akros meant "sharp-pointed".