In FNaF version - Lure Encapsulate Fuse Transport and Extract (shortened to L.E.F.T.E), better known as Lefty.

But...

In FNaS: FF version - Lovely Outstand Yabber and Agile Likeable Trusty Yippee (possibly, could be shortened to: L.O.Y.L.T.Y), better known as Loyalty.

(This was difficult to make the codename, but anyways... let's get to the reading)

~ "Yeah, this sounds very convincing. That Clone wouldn't never ever betray me at all! For sure!"

So I made a change for a name, because overall I was thinking for a quite while and it finally convinced me, that "Lefty" doesn't fit for a Clone in FNaS. Even it's based on a FNaF Character as a counterpart. And mainly because... a Clone can't do some stuff just like an Animatronic (in this case).

But still, the new name is an eqaulifient in Fierce Forces to FNaF name. And this tells not only the role, but also how the Clone is behaving towards the protagonist from the beginning. She's trustworthy and friendly.
(P.S. Her main role is being as a Shopkeeper & Supporter)

And about Righty Sonic, he will get a replacement. While his outfit will be inspired of Carnie from FNaF: HW 2. The name of the Clone... yes, the Clone (Ain't gonna be an Animatronic) will be different, but somehow similar to Carnie. Even though before, he had an extra name in Fierce Forces version.

The point is, I can't suddenly scrap the whole Character. It would be very difficult to come up with something else, since I have the planned script. As I said, I'm gonna make a change, because the Character has... let's say, a major role in the fancomic "Imagine It!".

Lefty Sonic's name was also changed mainly to match her brother's (Righty's replacement) new "reversed" name. Which will be revealed some other time.

Btw her full name is: Loyalty Sonic "Rosace-Up!"

And also a nickname (calling her in short): Floral
Because she is in a floral theme outfit (red rose)