Tsun in Chinese / Japanese...

詠春 is a martial arts technique that has an oral history (versus a written one) so very little can be said for sure about its origins.
Wing Chun (or Wing Cheun) is a Chinese martial art that emphasizes short combat strokes.

The characters 詠春 literally mean “Singing Spring” (as in springtime).

If you are wondering, the spelling and pronunciation of this martial arts style in English come from the Cantonese pronunciation of these characters. The second character sounds similar in both Mandarin and Cantonese, but the first is quite different.

Note: This title can be pronounced in Japanese, but only a Japanese practitioner of Wing Chun would recognize or understand this title. It is not considered a Japanese word or martial art at all.

劉家功夫 are the characters for the Lau Gar Kung Fu style of martial arts.

The romanization of “Lau Gar” comes from Cantonese. “Kung Fu” is the common romanization for English from the Mandarin “Gōng Fu” or Cantonese “Gung Fu” pronunciations.

Lau gar = Lau family.

詠春功夫 is Wing Chun Kung Fu.

The first two characters literally mean “Singing Spring” (as in springtime).

The last two are “Kung Fu” (high skill).

詠春拳 is the title for the “Wing Chun” school of martial arts but with the addition of the character for “fist” at the end. So this is “Wing Chun Fist” or literally “Singing Spring Fist.”

There are lots of alternate Cantonese romanizations for this, such as “Wing Chun Kuen,” “Wing Tsun Cheun,” “Eng Chun Pai,” and “Wing Ceon Kyun.” The characters are the same; just the lack of a standard Cantonese romanization means that people make up their own based on what they think it sounds like.

The first character means “wood glue” or can be understood as “sticky” or “sticking.”
The second character means “hand” (or “hands”).

This term can be romanized as “Chi Sau,” “Chi Sao,” or from Mandarin, “Chi Shou.”

黐手 is a concept that comes from the Wing Chun (AKA: Ving Tsun, Wing Tsun, or Yong Chun) style of martial arts. If you are looking for this term, chances are, you already know the meaning within the context of Wing Chun.

太極詠春功夫 is the title Tai Chi Wing Chun Kung Fu.

Please note that it can be romanized in a variety of ways such as:
Tai Chi Ving Tsun Kung Fu
Tai Qi Yong Chun Gong Fu
Taai Gik Wing Ceon Gung Fu

Be sure this is the right title for what you are looking for before you order.

鄭 is the Chinese surname Zheng, Japanese surname Tei, Korean surname Jeong, and Vietnamese surname Trịnh.

This can also refer to the state of Zheng during the Warring States period of China.

In Korea, this can be the original way to write the surname Jeong in the old days (now it's 정 in modern Korea). Can also romanize from Korean as Chung or Jung.

In Japanese, this is the surname Tei. But can romanize as the following Japanese names/surnames: Ti; Te; Tsun; Dziyon; Chiyon; Chon; Chou; Chun; Chuu; Chien; Zen; Jiyon; Jon; Jou; Jun.

In Vietnamese, this is the name Trịnh from the time before Vietnam romanized the language.