Kissaten Gongon

I was viewing an anime and during the show popped out a café named ゴンゴン. Out of curiosity I tried to look around to see if that could be some kind of onomatopoeia, but to no avail. So, does anybody know if it means anything or it's simply something put there because it sounded funny to the author?

In hiragana, it's a mimetic word for bang or crash.... I don't know if that's going to help any.

There is a Vietnamese cafe of that name in Fukuoka.
ngon ngon
In Vietnamese, it's seems the sense of delicious.

"ゴンゴン(ごんごん)" exactly one of "onomatopoeia".
http://daijirin.dual-d.net/extra/giseigo_gitaigo.html
→ 物が出す音(Sound things out)
→ 1. ぶつかる・打つ・たたく (crash/hit/beat) as continuous sound over 2 times

But...
that TV anime "Mitsudomoe Zouryouchuu!(2nd series) #ep1" cafe(kissa-ten) name is NOT onomatopoeia.
https://en.wikipedia.org/wiki/Mitsudomoe_(manga)
Maybe you know that scene based "Super Sentai Series(Live action/Tokusatsu)"
https://en.wikipedia.org/wiki/Super_Sentai
https://en.wikipedia.org/wiki/Tokusatsu
so that cafe name is parody of Himitsu Sentai Gorenger's snack/furuit parlor.
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https://en.wikipedia.org/wiki/Himitsu_Sentai_Gorenger
Gonpachi Edogawa (江戸川 権八 Edogawa Gonpachi?):
Commander of EAGLE's Japan branch. When operating in public,
Gonpachi disguises himself as the cook at the snack shop "Gon" (ゴン?),
which is the secret entrance to the Gorengers' headquarters.
The shop later becomes the fruit parlor "Gon".
http://blogs.yahoo.co.jp/taiyo1114/29239974.html
http://img-cdn.jg.jugem.jp/1ed/3273596/20150618_842491.jpg
スナック : snack (1st Ki[Yellow] Ranger "Oiwa Daita" eating "curry" his favorite)
http://takart.jp/wp-content/uploads/2013/03/20130304_gorenja_6.jpg
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"Gon" means commader's nick just his first name "Gon-pachi 権八" shorted/based.
https://en.wiktionary.org/wiki/%E6%A8%A9

TV anime"Mitsudomoe" series made by one of small animation company "bridge".
http://www.bridge-inc.co.jp/top2.html
Not by "Toei Animation(major/big company)" Super Sentai Series made.
So If using same name would conflict with "copyright".
Very simple reason as a one of small gimmick.


oops, forgot... NOT "Vietnamese".

Thanks a lot for the answers!

Wow, Blade_Braver, great explanation! You can tell that you know what you are talking about. I love when in shows there are references to older ones, so I'm happy to have expressed my curiosity. I knew that ごんごん was an onomatopoeia, but to me it doesn't make sense to write it in katakana if that was the intended meaning, or at least so I think, but I have little knowledge of Japanese at the moment.