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In page Marco Polo Bridge Incident:

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It is also known as the "Lukouchiao",[3] "Lugouqiao",[4] or "Lugou Bridge Incident" from the local name of the bridge, derived from a former name of the Yongding River.[5] This is the common name for the event in Japanese (蘆溝橋事件, Rokōkyō Jiken) and is an alternate name for it in Chinese (t 蘆溝橋事變, s 卢沟桥事变, p Lúgōuqiáo Shìbiàn) and Korean (노구교사건, Nogugyo Sageon). The same name is also expressed or translated as the "Battle of Lugou Bridge",[6] "Lugouqiao",[7] or "Lukouchiao".[8]