It's a tough one. It looks like a few different plants, but the hairy foliage and narrow low foliage stumps me.

It has some characteristics of these:

Phalaris arundinacae, Ribbon Grass...but it's too short.

Pleioblastus fortunei, Dwarf Whitestripe Bamboo...but again, too short.

Allium tricoccum, Wild Leek, Ramp...this may be the closest. It's a Lily, and the leaves grow straight of the ground. Sometimes it will show variegated leaves. It usually has wider leaves. If it's a wild Allium, you'll know when you transplant it, because you'll find small bulb-like tubers under it.

The closest grass I think it looks like is Yellow Fox Tail grass (Setaria glauca), but I'm still not 100% sure. The green part and two possible variegated parts are from the same root system I'm pretty sure. If it's a variegated mutation it probably originated from the base of the original green grass clump.

If it's a Setaria, you'll know when it blooms. Their flower is very distinctive.

S. glauca:

Thanks, I've seen those Yellow foxtail grass flowers in late summer or fall around the house.

Another possibility I think might be Thin Paspalum (Paspalum setaceum), I wish it were this since it's at least a short lived perennial.

I read Yellow foxtail is an annual, so the variegation would be lost when it dies in the winter, I wonder if I kept it as a houseplant if it would live for years?

Here are more pictures:

The only grass I've found so far that it might be is Yellow Foxtail Grass (Setaria glauca) or Thin Paspalum (Paspalum setaceum), but I'm still not 100% sure.
Here are some pictures of the same grass type but just the typical green, you can see how fuzzy the entire leaves are, even the leaf edges have hairs on it:
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You can see how I spotted it, the grass stood out when mowing outside of our centipede sod area:
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I'm now thinking Field Paspalum (Paspalum laeve).

Here is a link that might be useful: Paspalum laeve

Whatever it is, it's kind of nice looking, and definitely deserves the chance to grow out and see if it is a stable mutation. I had a bamboo do that once on a new culm, the foliage was heavily variegated with cream and yellow stripes, but unfortunately, the rhizome only put out plain green culms beyond that one, no way except possibly tissue culture to propagate it.

Thanks, I've read if any green comes out in a variegated plants then cut back the green parts to encourage the variegated parts to grow out strong, because the green can take over and out-compete the usually weaker growing variegated parts. So that's what I might do (try and starve the green half to death by keeping it's leaves cut very low).

Looks like bulbous oat grass to me.

Here is a link that might be useful: Bulbous Oat Grass

still cool either way, maybe water it really well to loosen the soil and pot it. You can divide it a couple times before Fall and you can replant it and take chances on those. Any seeds can be replanted, but may not all carry the trait.. Select, select select/ Also, if the trait goes away in the new pots with good potting soil, it was a nutritional issue but I don't think so...

any updates???