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Last Name Otsu

What is the origin of the last name Otsu?

The surname "Otsu" is a Japanese name that originates from various locations in Japan. In Japanese, "Otsu" can refer to several places, such as the city of Otsu located in Shiga Prefecture, or it could be derived from personal names or titles that have been passed down through generations. The city of Otsu, for instance, was historically known as Ōtsu-no-miya (Great Shrine of Otsu), a title given to the Imperial family member who served as the Governor of Omi Province, which is now present-day Shiga Prefecture. The name could have also been taken from the Otsu River or Otsu Mountain, both located in the same area. As with many Japanese surnames, "Otsu" was traditionally a hereditary title, passed down through male descendants, but today it can be used by anyone in Japan regardless of gender or ancestry.

Learn more about the origin of the last name Otsu

The meaning and origin of the last name Otsu

The surname Otsu is of Japanese origin, specifically from the Kansai region which includes cities like Kyoto and Osaka. It is derived from two characters in the Japanese Kanji script: 大 (O) meaning "large" or "great", and 津 (Tsu), which refers to a natural harbor or crossing point on a river. Over time, it has been Romanized as Otsu in Western contexts.

Historically, the name could have originated from various places named Otsu across Japan. One of the most notable is Otsu City, formerly known as Ōtsu-shi, located in Shiga Prefecture. The city's name derives from its geographical position at the point where Lake Biwa connects with the Yodo River.

As a common Japanese surname, it can be found in various regions of Japan today. Like many other Japanese names, the specific meaning and origin of Otsu may not always be known due to changes over time and the passage of generations.

Geographical distribution of the last name Otsu

The surname Otsu is predominantly found in Japan, where it originates from the Kansai region, specifically the prefectures of Shiga and Kyoto. It is also spelled as Ozu or Otsugu in some instances. Historically, the name has been associated with the ancient Yamato province, indicating a long and rich history within Japanese society. The Otsu clan was one of the minor samurai houses that supported the Imperial Court during the Heian period (794-1185 AD). Over time, the name has spread throughout Japan due to various factors such as migration, marriage, and assimilation. In recent years, there have been some instances of individuals with the surname Otsu in other countries like the United States and Canada, primarily due to immigration from Japan.

Variants and spellings of the last name Otsu

The surname Otsu can have several variations and spellings due to differences in transliteration and regional pronunciation. Some common spelling variants include Ohtsu, Otzu, Otsughi, Otsuki, and Ochisu. In Japanese, the name Otsu is written as 大津, which can be read as "Ōtsu" or "Otsu." It is also a city in Shiga prefecture, Japan. The kanji characters 大 (ō) meaning large or great and 津 (tsu) meaning harbor or port, indicate that the name Otsu translates to something like "large harbor." In English, it can also be spelled as Oh-Tsu, Ohtsus, Otzus, etc., depending on individual preference or regional conventions for the representation of Japanese names.

Famous people with the last name Otsu

One of the notable individuals with the last name Otsu includes Yuriko Otsu (born 1942), a prominent Japanese actress and model who won the Miss Japan pageant in 1963, representing Japan at the Miss Universe competition the same year. In her career spanning over five decades, she has appeared in numerous movies, television dramas, and commercials. Another significant figure is Yusuke Otsu (born 1980), a Japanese professional baseball player who plays for the Fukuoka SoftBank Hawks of Nippon Professional Baseball (NPB). He was named MVP twice in his career - once in the Japan Series and once in the Asia Series. In the world of sports, Hiroshi Otsu (1932-2018) also stands out as a successful Japanese racing driver who won the 1967 Formula Two championship.

Genealogical research on the last name Otsu

The surname Otsu originates from Japan and is a variant of the more common Otsuki or Otsuki, both being derived from the place name "Otsu" in Shiga Prefecture. Historically, the area was associated with the powerful and influential Mononobe clan during the Asuka Period (538-710 AD). The Mononobe are believed to have originated from the Yamato Tribe and were one of the dominant clans of the period. The surname Otsu can also be found in other parts of Japan, indicating that it may have been adopted by individuals who moved or were descendants of those who moved away from the original area. Genealogical research is ongoing to trace the exact origins and lineages of the Otsu family, but it is clear that they share a rich history with the Mononobe clan and the region of Otsu in Shiga Prefecture.

Last name distribution maps

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Sources & References

About the author :
NomOrigine Team
NomOrigine Team
Passionate about genealogy, name history, and linguistics, we have been analyzing the origins of names for over 3 years. Our content is based on verified historical, etymological, and statistical data.
Last updated : 11 June 2025

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