How about:
decimaliste ?
According to this dictionary, decimalist has meaning in British English (https://www.collinsdictionary.com/us/dictionary/english/decimalist) as " a person who is in favour of decimalism". With decimalism defined as: “a method or practice based on units, divisions, or multiples of ten”
So I add an “e” as a bit of an embellishment.
Although I understand your point of view, perhaps it’s the differentiation that would set this system apart from all the others. After all, it’s designed to organise our lives, isn’t it? It can never be too personal.
As far as the index is concerned, I’m surprised that nobody, unless I’m mistaken, has mentioned Vannevar Bush’s Memex. In any case, memory seems a good semantic field to explore. As a last resort, we’re left with Johnny Mnemonic. 
Another idea I thought of. Instead of:
I came up with:
I just kinda like the way that sounds. It is inspired from something the owner the company I work for said when we came up with some shortcut ways of doing a job. He said, yes it will work, but “it’s not the [company_name] way”.
The 10.10.100 system.
Pronounce ten-ten-hundred. No translation issues.
“A life classification system.”
A useful way to think of the index is as the taxonomy of a system. A stream of consciousness follows:
Another way to think of the index is as a sort of router that points you to a specific route to get to your stuff.
…It’s also a system of record. This is urging me to use DNS-y terms, as each entry in the index is also a sort of a record:
I’m certain there are other ways to come at all this, I’ll jump back in with anything else I come up with.
A couple words that haven’t come up yet:
I like registry in that it subtly implies you register things there. Just what kind of things you register is not prescribed, so…you could call it thingamaregistry. That’s too long to my liking though.
I’m brand new here but I happened to stumble across this and the word that immediately came to mind was:
It could stand for ‘coordinate index’ or ‘code index’. It reminds me of the Pokedex that catalogued Pokemon.
I checked Wikipedia and this is what it says: “The codex was the historical ancestor of the modern book.” I thought it was poetic in a way.
Some play on origo or origin?
Just realized the JD system could have quadrants… 
(need to have a think on that one > instead of having several systems, the AC and ID numbers could be positive and negative… might not bring much to the table / unecessary complexity)
Before I read any of the other replies, let me suggest “Johnny.Dex”.
.jdex file extension for tooling.For optional personalization:
Oooooohhhhhh … I like this. I like this a lot…
This is cool.
It’s been brought up a few times in threads around here that parents don’t know what to do with their kids. (in a JD way, not in a life direction way)
I think JD is a life-org system. As such, each independent life should have its own system. Johnny.Dex, Lucy.Dex, Chicken.Dex seems like the most sensible, with a unified staple JD hierarchy underneath is the most logical dream for how JD might work for everyone. This way Chicken.Dex can be shared in its entirety with all caretakers without cross-system ID conflicts.
Ping @LucyDecimal who is gonna lose her mind at Chicken.Dex.
Just want to say that dex has a super nice ring to it and it makes a lot of sense!
How about calling the Index the Atlas?
A bit of a double meaning…
Atlas - a collection of maps
But also, Atlas, doing all the heavy lifting. Holding up the weight of the world.
We have settled on a name.
The website is days away from a major release, we’ve been rewriting it for a couple of weeks now… so I’ll let y’all wait. 
I am more excited about this than I probably should be 
@obsidian_starcaller pulled it out of the bag with JDex.
Hit us up if you want a sticker! It’s the least we can do for this work of genius.
I’m happy you like it. I don’t need anything.