Prompt Detail:
Relatives of Lech, Bojek, and Bohemians may be Boj Chełmowie, meaning 'Mountain Warriors' or 'Great Warriors' as 'chełm' means mountain. Meanwhile, the name Vandals may mean 'Wanów, Wandów, Wendów from the valleys', where 'dal' means valley. Alternatively, it may refer to the Wend people from the southern region of the Vistula River, where the Vandals had their original settlements, up to Krakow with the legend of Wanda. Vincent Kadłubek derived the name of this people, which is another name for Lechites or ancient Poles, from the name Wanda.
Perhaps this is only folk etymology, or perhaps the existing explanations in etymological dictionaries are also only the result of a certain overinterpretation under specific assumptions far from historical truth. In return for appropriating the names of Germans, Slavs, and Prussians, the Slavs reciprocated the Teutons with nicknames like 'Niemcy' (mute), 'niemi' (mute), or calling them 'prusaki' (an unpleasant bug). The exonym 'Niemiec' can also mean 'not us' in the sense of 'foreigner', in opposition to 'our, Slavic', or 'not with the sword', meaning 'not from a sword, clan', or 'not having', i.e. one who does not possess land. The Germans themselves, in order to undermine such a humiliating designation, derive this name from some minor Celtic tribe Nemeti, which may remind us of 'niemotami' (incompetent) or 'ne mati', meaning 'orphans' without a 'mati', motherland, or land, which seems to be convergent in meaning with the version 'not having'.
Similarly, in the area of eastern Slavdom, names of state entities were also manipulated for their own purposes. We remember that even the name of the Roman Empire was deliberately taken over by the Germans, even though there was already such an Empire in Constantinople. As a result of the competition for political and image legacy after the Roman Empire, to distinguish them, the empire ruled by the Franks began to be called in historiography 'Western', while the one with the capital in Byzantium, 'Eastern'.