Haruka Ayase’s Real Surname ‘Tademaru’ Is So Rare Only a Dozen-ish People in Japan Share It — 5ch: ‘Just Make Her Stage Name “Tadase Haruka” Already’

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The story

A Yahoo! News article reporting that actress Haruka Ayase’s real surname is “Tademaru” (蓼丸) — a rare name held by only about 10 people nationwide — got picked up on 5ch’s Geinou Sports Breaking News+ board. The original article is the second installment of a series on the surprising real names of popular actors and actresses, featuring Ayase alongside several other celebrities.

The thread lit up with surprise over how to even read “Tademaru” and where it comes from, and the conversation spread as users brought up other celebrities’ unusual real names, like Satomi Ishihara and Ennosuke Ichikawa — though some also questioned the basis for the article’s claim that “only a dozen-ish people nationwide” share the name.

Wait, that’s their real name?! Actors with surprisingly unexpected real names (Part 2): who has a rare surname shared by only a dozen-ish people nationwide?

Among actors and actresses, while fans know them by their familiar stage names, some actually have rare surnames or surprising real names held by only a few dozen people nationwide.

Tracing how a name came to be, and the behind-the-scenes story of how a stage name was born, reveals glimpses of who someone really is and the path they’ve walked. This piece looks at the real names of five stars. Part 2.

Source: news.yahoo.co.jp / Original article here

What people said

5AnonymousNov 9, 2026 09:32
It's wild that her real name alone sounds like it could be a Takarazuka Revue stage name.
7AnonymousNov 9, 2026 09:33
The guy who's always first to get namedropped in threads like this
I'm so sick of seeing it already
8AnonymousNov 9, 2026 09:33
If she'd debuted under her real name, would she even have become popular?
10AnonymousNov 9, 2026 09:34
Finding out Satomi Ishihara's real name was the biggest shock of all for me.
12AnonymousNov 9, 2026 09:34
Not so much surprising as it's a perfect fit — former komusubi-rank sumo wrestler Chiyotairyu's real name.
14AnonymousNov 9, 2026 09:36
She's been teased about this for twenty years already, and NOW it's news?
17AnonymousNov 9, 2026 09:37
Aaron Rodriguez Arellano
18AnonymousNov 9, 2026 09:38
Tademaru (蓼丸)
[Reading] Tademaru
[Romanized] Tademaru
[National Rank] 91,278th
[Nationwide Count] Roughly 10 people

Found in small numbers in Hiroshima Prefecture. The "tade" element traces back to a word for structures built on open wilderness, derived from things tied to castle walls and moats. Linked to the Date clan. There's a Yamakage lineage of the (Fujiwara) clan name that traces back to Emperor Tenji bestowing it on Nakatomi no Kamatari.
20AnonymousNov 9, 2026 09:39
Tademaru's actually a solid name — she's got an older brother and a nephew, so the family line's secure.
21AnonymousNov 9, 2026 09:40
At this point just make her stage name "Tadase Haruka" already (a mashup of her real surname Tade- and her stage surname -se from Ayase)
27AnonymousNov 9, 2026 09:43
Aja Kong's real name is cute
77AnonymousNov 9, 2026 10:45
Re: #27
Looked it up, it's not particularly cute
28AnonymousNov 9, 2026 09:44
Maybe her marriage is taking so long because she needs a husband willing to marry into the family and take the surname?
30AnonymousNov 9, 2026 09:45
The whole reason to use a stage name is that you have zero attachment to it as your everyday legal name, though.
39AnonymousNov 9, 2026 09:52
I've seen footage of her older brother calling her "Aya"
Anyway, sounds like she's not fading out of the business anytime soon
42AnonymousNov 9, 2026 09:53
Google "Tademaru" and a farmer comes up — that's probably her older brother.
48AnonymousNov 9, 2026 10:01
With a surname this rare, doing showbiz work under her real name sounds like a pain. Nobody could even guess how to pronounce it.
57AnonymousNov 9, 2026 10:07
Re: #48
A foreign technical intern trainee? (joking that the name sounds non-Japanese)
56AnonymousNov 9, 2026 10:07
"Just once, I'd love to see the spot where my wife hides her secret stash… this is Tademaru, signing off." (riffing on the classic salaryman-senryu joke format that signs off with a punny name)
65AnonymousNov 9, 2026 10:23
Re: #56
What was the original reference again? Hikomaru?
58AnonymousNov 9, 2026 10:08
Hasn't this exact thread been posted on this board like ten times already?
59AnonymousNov 9, 2026 10:10
Sarina Suzuki also has a flashy real name
Makes you wonder why she went with "Suzuki" of all things
61AnonymousNov 9, 2026 10:12
Re: #24
Reina Triendl's mother's maiden name was "Nikumaru," but her parents never divorced or anything after she was born
so Reina herself just went by her Austrian father's surname, Triendl, like normal, until she got married
62AnonymousNov 9, 2026 10:16
Turns out her stage-name surname "Ayase" is actually pretty rare too.
64AnonymousNov 9, 2026 10:22
Re: #57
You'd basically need someone to tell you
Plenty of people wouldn't know how to read it
Could YOU read it on sight from the start?
66AnonymousNov 9, 2026 10:26
Wild that typing "tademaru" brings up "蓼丸綾" (Tademaru Aya) as a predictive-text suggestion
70AnonymousNov 9, 2026 10:32
Radio handle: "Real-Name's-Fine Sylvester Stallone" (riffing on the classic radio call-in joke-pseudonym format)
73AnonymousNov 9, 2026 10:39
It's Ms. Tademaru from Horipro, okayyy….
74AnonymousNov 9, 2026 10:39
Re: #1
Re: #1
Who actually verified this "only a dozen-ish people nationwide" claim anyway? This kind of made-up stat has run wild ever since surname-lookup sites got popular
The media can just lie freely now

Background and Key Points of This Discussion

Claims about how many people nationwide share a given surname tend to spread online without any cited source, and in this thread poster #74 raised exactly that doubt, asking “who actually checked this?” In reality, these rare-surname rankings are usually estimates compiled by surname-lookup websites from sources like phone directories or postal records — not results from an exhaustive survey like a national census. The topic of Haruka Ayase’s real name is also old ground that’s been rehashed many times among 5ch regulars, with some in the thread saying this must be the tenth time the thread’s been made — so part of the energy here came from nostalgia rather than novelty. The original article itself is the second installment of a series on the real names of popular actors and actresses, and besides Ayase it also cites examples like Satomi Ishihara and Ennosuke Ichikawa, with the gap between real names and stage names as the throughline.

※This article is a summarized excerpt based on the 5ch (Geinou Sports Breaking News+) thread “[Entertainment] Wait, that’s their real name?! Haruka Ayase has a rare surname shared by only a dozen-ish people nationwide.”

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