> クリストファー・ベックウィズ(英語版)が高句麗語を日本語の姉妹語と仮定し、両者の共通祖語としてCommon Japanese-Koguryoicを想定した[34][35][注釈 7](Beckwith 2004)。
> 李基文(2011)はあるいは高句麗語は日本語と朝鮮語の中間的な言語であったと想定できるかもしれないとも述べている[38](李2011)。
>
> ウィキ「高雲」
> 生涯
> 高雲の出身は355年、前燕の慕容皝が楽浪郡を落として冊封された高句麗の王族である。高句麗の王族は姓を高氏として青山に移り、前燕や後燕に仕えた。高雲は後燕の慕容宝に仕えた。
>
> He was ethnically Korean and a descendant of the royal house of Goguryeo, whose ancestors were captured by Former Yan.
>
> Early life
> Gao Yun's ancestors were from the Goguryeo royal house. When Murong Huang defeated Goguyreo forces and temporarily occupied its capital Hwando, he took many members of the Goguryeo royal house captive and moved them to Qingshan (青山, in modern Jinzhou, Liaoning), and their descendants became Former Yan and Later Yan subjects. Because the surname of Goguryeo's royal family, in Chinese, was Gao (高, meaning high, great, strong, elder), they largely took Gao as their family name.