May
I knew there’s a person named Abe Seme “安倍晴明” when I was reading 阴阳师，the story was about 1300 years ago…so I wonder
Answer:
There are many lines of Abe name. Abe is old name. However, since Japanese people adopted similar names or changed the character of their names like 阿部 安倍 阿辺 安部 in after ages, you can't presume all the 安倍 names have the same origin. As for the line for Abe Seimei “安倍晴明”, it has less relation with the line of Fujiwara name. It's Mutsu country's (northern part of Japan) line and different clan.
安倍晴明 was born in Osaka and lived 921-1005 (tradition).
The oldest Abe name of his line (ancestor) can be 阿倍大麻呂 which is found in the era of 宣化天皇, who lived 467-539, in the ancient Japanese document.
His line is called 安倍氏土御門家 Abe name -Tsuchimikado families.
A shrine built for him still exist in Kyoto.
http://farm4.static.flickr.com/3225/2491…
Answer:
you have people running around with the surname - Fujiwara - a name originally belonging to a powerful family of court administrators in the Heian Period (794-1192).
The name was first coined in the 7th century after a political coup against the Soga clan so there are surnames still in used today that predate the 8th Century.
Keep in mind surnames were only for the upper classes. Commoners weren't given such until the mid-19th century during the Meiji Period.
Answer:
He was not Seme but Seimei and yes one of classical family name Abe is which is still effective now in Japan.
Answer:
I don't know about oldest but it's certainly one of the most common.