Guan Yi in Chinese / Japanese...

關 is a surname in three languages.
In Chinese, it romanizes as Guan.
In Korean, it's Kwan (or Gwan).
In Japanese it's Seki.

The meaning of the character is mountain pass; to close; to shut; to turn off; barrier; frontier.

關公 is a Chinese title, Guan Gong, that means Lord Guan (The warrior saint of ancient China).

While his real name was Guan Yu / 關羽, he is commonly known by the title of Guan Gong (關公).

Some Chinese soldiers still pray to Guan Gong for protection. They would especially do this before going into battle. Statues of Guan Gong are seen throughout China.

觀世音 is an alternate title for Guanyin, the Bodhisattva of Compassion or Goddess of Mercy.

觀世音 is the Buddhist bestower of children, the protector of life and all in distress (especially of those at sea).

關羽 is the name Guan Yu, Army General for the Kingdom of Shu.

He is also known as Guan Gong (like saying Duke Guan or Sir Guan)

He was immortalized in the novel, “Romance of the Three Kingdoms.”

He was a fearsome fighter, also famous for his virtue and loyalty. He is worshiped by some modern-day soldiers and has the title “Warrior Saint” in China. Some believe he offers safety and protection for military servicemen.

Guan Yu lived until 219 A.D.

形意拳 is the title for the Xingyiquan style/form of Chinese martial arts involving explosive linear movements.

Some translate this as “shape-of-the-mind fist.”

While pronunciation has never changed in Chinese, the old romanization was “Hsing I Chuan.” This romanization for 形意拳 is still used in Taiwan.

This term is used in some Japanese martial arts circles where it's romanized from Japanese as keīken, keiiken, or keiken.

This is the Chinese martial arts known as Mizong-Yi or Mizongyi based on deception and mobility.