This is sort of a crackpot theory, but I'll go for it anyway. The name Armin is the modern form of the name Arminius, which is a the Latin version of the name Herman. In history (real-world) Arminius/Herman was a German, born in the late 1st century BC and died in the early first century AD, was taken as a hostage from the Romans in his youth, entered the Roman army, fought for Rome as an Auxiliary, became one of Publius Quinctilius Varus' - a Roman politician and general- most trusted man, and in the end betrayed him.
His betrayal consisted of persuading Varus to have his army (3 legions) to march through Teutoburg forest during the winter in order to quell a German rebellion. He had the other Germanic chieftains set up an ambush there. Varus fell for it and the Romans suffered one of the heaviest defeats ever. The Roman retreated forever from Magna Germania, although they attacked the Germans several times in the later years and defeated them just as many times.
My theory is that our Armin will do something similar; he will lure the Titan(s)/Shifter(s)/Warrior(s) in the forest of giant trees and they will suffer a heavy defeat that will cause them to retreat forever from... well I'm undecided between the territory of wall Rose, or territory of wall Maria (I hope it's the latter, about time humans reconquered it).
On the other hand the ambush might have already happened, twice in fact. The name Erwin comes from the name Irwin, that comes from the name Irmin, that comes from the name (drum roll) Armin. The temporary capture of the Female Titan was an ambush, and Annie was lured into the forest of giant trees, while the battle that happened in the last 2 chapters is not really an ambush, but it happened near the forest of giant trees and the Titans were lured there by Erwin.
Authors surely like to use names that do have a meaning.
Best example is Umineko.Do not read unless you're past EP 2 and 3.
Naruto also comes to Mind.
But yeah why not.I'll take consideration of this.
I'm glad you support my theory though.
Actually, this is not a crackpot theory at all. It does make sense. And the way you put it, I've some high expectations from Armin. Maybe he's weak and not strong in combat, but his strategic abilities will lead to a certain, massive, ambush of titans and humankind will succeed. And since Isayama does everything with a plan, so how about he does it too?