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Digimon are digital lifeforms, and are made up of computer data, right? As we know, every kind of data file has an extension, or file format, for example a Microsoft Word document has ".doc" as its extension, a web page has ".html" and an image has ".jpeg", ".png", ".gif" etc, so perhaps the same thing applies for Digimon.

 

Perhaps there is a file for every different Digimon (as in entire species, rather than singular Digimon), with that file format being ".mon", for example, the Agumon species filename would be "Agu.mon".

Digimon are digital lifeforms, and are made up of computer data, right? As we know, every kind of data file has an extension, or file format, for example a Microsoft Word document has ".doc" as its extension, a web page has ".html" and an image has ".jpeg", ".png", ".gif" etc, so perhaps the same thing applies for Digimon.

Perhaps there is a file for every different Digimon (as in entire species, rather than singular Digimon), with that file format being ".mon", for example, the Agumon species filename would be "Agu.mon".

Just like what Memor-X answered:

Just like what Memor-X answered:

The Suffix -Mon means Monster as what the title also means.

Source  : Digimon(Creature) Wikia

As for the Data File Extension theory, here is a possible connection. Digimon have different attributes. We know that Digimon are digital Lifeforms residing in the digital world.

from Wikia

Digimon are digital lifeforms, and are made up of computer data, right? As we know, every kind of data file has an extension, or file format, for example a Microsoft Word document has ".doc" as its extension, a web page has ".html" and an image has ".jpeg", ".png", ".gif" etc, so perhaps the same thing applies for Digimon.

Perhaps there is a file for every different Digimon (as in entire species, rather than singular Digimon), with that file format being ".mon", for example, the Agumon species filename would be "Agu.mon".

I think it is what makes the most logic,something that is not directly explained because it requires you to think  ."Dra" always refers to "dragon", "devi" to "devil", "Vam" to "Vampire, "De" to "demon" and so on. All the others have names that are a reference to something, whether it be a noise (Like Koromon) or otherwise. A file type does sound best and makes sense.

and ukyouluvr's Explanation

Zero ARMS: Grani is a ZERO-ARMS whose name and design are derived the mythological Grani, the steed of the hero Sigurd. It serves as a flying mount for Gallantmon.

That explains it, but still doesn't really justify the choice. Everyone realizes they're "Digital monsters" not every creature needs a label. Oh well, at least it's fun. Also this might be due to making it more Unique that in a way when you say a name like Agumon or Greymon anyone who hears it wouldn't say "Those are Digimons, right?" but would think exactly that "Those are Digimons" due to the -mon suffix.

Furthermore All Digimon names have an Etimology/meaning. For example, Birdramon means "Bird Dragon Monster". It also helps make non-Digimon Digital entities seem even more alien/bizarre to the setting. For example, Eaters feel "wrong" because they are not even Digimon but an entire different thing/monster. If Digimon didn't had the -mon suffix, the effect would be lost and Eater would be "just another Digimon"

As for my previous Comment. It is just stated that the OP is asking about why the names of Digimon ended with Mon. The Answer of Memor-X is Correct it's just that saying that Digimon is like Pokemon is somewhat not right. We know that digimon names end with -mon if we're talking about the names and for pokemon, they doesn't. Its just because that Digimon is named with -mon at the end because it may be a pun invented by its creator.

At First, it is titled Pocket Monsters however they shortened it to Pokémon for a catchier name and also because the term pocket Monsters was already coined in the U.S.

The suffix -mon means monster as what the title also means.

Source: Digimon  (creature) Wikia

As for the data file extension theory, here is a possible connection. Digimon have different attributes. We know that Digimon are digital lifeforms residing in the digital world.

From Wikia:

Digimon are digital lifeforms, and are made up of computer data, right? As we know, every kind of data file has an extension, or file format, for example a Microsoft Word document has ".doc" as its extension, a web page has ".html" and an image has ".jpeg", ".png", ".gif" etc, so perhaps the same thing applies for Digimon.

 

Perhaps there is a file for every different Digimon (as in entire species, rather than singular Digimon), with that file format being ".mon", for example, the Agumon species filename would be "Agu.mon".

I think it is what makes the most logic,  something that is not directly explained because it requires you to think. "Dra" always refers to "dragon", "devi" to "devil", "Vam" to "Vampire, "De" to "demon" and so on. All the others have names that are a reference to something, whether it be a noise (Like Koromon) or otherwise. A file type does sound best and makes sense.

and ukyouluvr's explanation:

Zero ARMS: Grani is a ZERO-ARMS whose name and design are derived from the mythological Grani, the steed of the hero Sigurd. It serves as a flying mount for Gallantmon.

That explains it, but still doesn't really justify the choice. Everyone realizes they're "Digital monsters"; not every creature needs a label. Oh well, at least it's fun. Also this might be due to making it more unique that in a way when you say a name like Agumon or Greymon anyone who hears it wouldn't say "Those are Digimons, right?" but would think exactly that "Those are Digimons" due to the -mon suffix.

Furthermore, all Digimon names have an etymology/meaning. For example, Birdramon means "Bird Dragon Monster". It also helps make non-Digimon digital entities seem even more alien/bizarre to the setting. For example, Eaters feel "wrong" because they are not even Digimon but an entire different thing/monster. If Digimon didn't have the -mon suffix, the effect would be lost and Eater would be "just another Digimon".

As for my previous comment. It is just stated that the OP is asking about why the names of Digimon ended with -mon. The answer of Memor-X is correct, it's just that saying that Digimon is like Pokemon is somewhat not right. We know that Digimon names end with -mon if we're talking about the names, and for Pokemon, they don't. Its just because that Digimon is named with -mon at the end because it may be a pun invented by its creator.

At first, it is titled Pocket Monsters. However they shortened it to Pokémon for a catchier name and also because the term Pocket Monsters was already coined in the U.S.