I've seen young (at least teenage years) Polish males names Szymon and Jakub
These aren't genuinely Polish names. They are Jewish names.
They aren't "cool", "youthful", or "modern" names either.
Both are older than dirt; that's how obsolete they are.
They also have very negative connotations.
First, there is way too much polarising religious baggage associated with these two names.
The first thing that comes to mind are old, barrel-shaped, black-clad rabbis shuffling along with big scraggly beards and even bigger funny hats that are never in fashion.
The use of these names is a very big problem especially in an ever increasingly secular world; particularly among the young of today who see religion as oppressive, divisive and irrelevant.
Second, there are also many old, thuggish, Zionist politicians in Israel with these names. The same ones who spew fascist, racist hatred like saying openly that "Israel isn't for all of its citizens", "Jerusalem is only for Jews", and who also build walls around Israel and call refugees "infiltrators" amid baying crowds of elderly Israelis demanding their expulsion.
The use of these names is an even bigger problem especially in an ever increasingly globalised world; particularly among the young of today who are informed and committed to diversity, inclusion and respect.
And the problems with these names don't stop there!
Their origins show they are actually cartoonish nicknames.
In the case of the name Szymon, the Jews derived the name (because of no originality on their part and need to culturally appropriate) from a Greek word meaning "flat-nosed".
The name Jakub actually means "heel" as in the rear, underside part of the foot.