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Koda( 幸田） originated from Shimousa-no-kuni ( 下総国 ; now in Chiba and Ibaraki Pref).
Watanabe( 渡辺 ) came from the area name, Watanabe , in Osaka . In 10 th Century, a man ( Sagagenji-no-tsuna ) changed his surname to Watanabe(-no-tsuna ) when he moved here from Musashi (Now in Tokyo ).
The origin of Kataoka （片岡） is in Ohmi (in Shiga ) and Yamato ( Nara ).
Koga （古賀） originated from North Kyusyu Area
As to Koizumi （小泉） , it is said that its origin is place names but we have various accounts where it comes from, such as Nagano , Shizuoka , and Nara Pref, etc.
POPULATION PERCENTAGE SURNAME MINIMUM MAXIMUM MEAN STANDARD DEVIATION Koda 2 592 100 126 Watanabe 351 39703 7059 7948 Kataoka 22 3429 766 842 Koga 2 13935 740 2097 Koizumi 8 5791 725 1170 SURNAME MINIMUM MAXIMUM MEAN STANDARD DEVIATION Koda 0 12.6 2.1 2.7 Watanabe 0.1 12.0 2.1 2.4 Kataoka 0.6 9.5 2.1 2.3 Koga 0 40.1 2.1 6.0 Koizumi 0 17.0 2.1 3.4
figures are not affected by total pop in prefectures.
More appropriate to compare how much surnames diffuse
S L : Pop with a surname in a pref. S N : Pop with a surname in Japan P L : Pop in a pref. P N : Pop in Japan
Represent names by Index ( Koda [ 幸田 ]); Rank 1311
Tend to concentrate around Tokyo and West Japan, especially in Tokushima Pref.
Represent names by Index ( Watanabe [ 渡辺 ]); Rank 9
Diffuse into whole of Japan, especially into East Japan, Especially in Fukushima and Niigata Pref.
Represent names by Index ( Kataoka [ 片岡 ]) Rank 203
Diffuse, especially, into West Japan, especially in Kochi and Okayama Pref.
Represent names by Index ( Koga [ 古賀 ]); Rank 213
Concentrate on North Kyusyu Area, especially around Echizen Area ( Fukuoka , Saga and Nagasaki Pref.)
Represent names by Index ( Koizumi [ 小泉 ]); Rank 219
Diffuse widely, especially in Kanto Area
Although Koda`s population is less than 750 in all prefectures, great percentage of this surname can be observed in Tokyo, Osaka and Hyogo prefectures. However, the possibility of encountering Koda is higher in Tokushima
Watanabe is well spread in the country but significant percentage of this surname is in the Kanto and south of Tohoku region. You may also have greater chance of meeting people with this surname in Yamanashi, Fukushima and Niigata
The distribution of Kataoka surname in Japan is observed to concentrate in the Kanto and Kansai regions. But greater chance of meeting them in Kochi and Okayama
The distribution of Koga surname follows the same trend in all population, percentage and index maps which generally concentrates in the South and Southwest portions
Most population and percentage distributions of Koizumi surname has been observed in the Kanto region and in Hokkaido and Osaka. However, the chance of meeting them is higher in Yamanashi, Aomori, and Ibaraki
Surname and place name ( Koda [ 幸田 ])
It seems that many people with surname, Koda, tend to live near places with name, Koda .
Exception is Tokushima Pref.
No. of place Green bars show the number of places with the name of Koda, accodring to JapanKnowledge.
From place name ( Koda [ 幸田 ])
JapanKnowledge shows Kochi has no place name of Koda , however, in fact Kochi has it as small districs
Koda , Tachibana-cho, Anan City, Tokushima Pref. ( 徳島県阿南市橘町幸田 )