I like the simplicity and originality of the name with the combinaison of their names. (And it's only my opinion, but I much prefer that as "Gang kid" for choosing an example with an other recent name for a Kpop Girlsband)And with "just" the combinaison of their names, it's almost not a real name but just an indication of which SNSD members are here. especially with the "Girls'Generation-TaeTiSeo". They keep the statu of SNSD so it's really a sub-unit and not a new group with some of SNSD's members.
I can easily see other subunits with rotation of the girls (and not only 3 members Sub-unit: why not 2, 4 or 5 ) and why not a full album with songs from all the mini-albums of each subunit and one new with all the 9 girls.

hmmm it sounds really weird

I would've liked Taenyhyun

Yep it would be so nice if they choose Taenyhyun

You would think they would have something more original