grad, gard, gord, gorod, hrad…
these are all words that in slavic languages mean fortified settlement.
wikipedia page about gord says:
A gord is a medieval Slavic fortified settlement, also occasionally known as a burgwall or Slavic burgwall after the German name for these sites. The ancient peoples were known for building wooden fortified settlements. The reconstructed Centum-satem isogloss word for such a settlement is g'herdh, gordъ, related to the Germanic *gard and *gart (as in Stuttgart etc.). This Proto-Slavic word (*gordъ) for town or city, later differentiated into grad (Cyrillic: град), gard, gorod (Cyrillic: город), etc. The most explicit derivatives from grad are the Croatian word Gradjanski (Croatian: Građanski) and the Russian word Grazhdanye (Russian: Граждане) both means citizens.
Slavic names: Prior to the medieval Ostsiedlung, Slavic languages like Polabian, Sorbian, Pomeranian, and Slovenian were spoken in the eastern parts of the Holy Roman Empire. The German settlers and administration in many cases adopted existing Wendish placenames, for example Rostock (from Old Polabian rostok, "river fork"), Dresden (from Sorbian Drežďany), and Berlin (possibly from a Polabian word meaning "Swamp"). For the same reason, many German placenames ending in -anz (e.g. Ummanz), -gard (e.g. Burg Stargard), -gast (e.g. Wolgast), -itz (e.g. Lancken-Granitz), -ow (e.g. Gützkow), and -vitz or -witz (e.g. Malschwitz) have Slavic roots. Due to spelling and pronunciation changes over the centuries, the original Wendish term in most cases is not preserved. Also, some placenames combine a German with a Wendish term (e.g. Altentreptow). The German suffix -au can be related to the Slavic -ow and -ov when derived from the Old German spelling (u= w =double u; e.g. Prenzlau was earlier spelled Prenzlow).
It is interesting that wikipedia didn't mention stutgart. stutgart is a sore point for german historians. it lies in the middle of what used to be polabian slavic land, and it has a slavic name…
Proof that all place names with endign gord, gard, gart are slavic in origin is in the following:
A gord is a medieval Slavic fortified settlement, also occasionally known as a burgwall or Slavic burgwall after the German name for these sites
So germans called slavic gords burgwall.
many slavic towns with gord or gard in its name were renamed to burgs after they were captured by germans.
Mecklenburg Castle was a medieval castle and a residential capital of the Nakonid and Nikloting dynasties of the Obotrites
The travelling merchant Ibrahim Ibn Jacub described Mecklenburg as “Nakon’s Castle” in 965. By 995 it was documented as Michelenburg or Mikelenburg, meaning large castle in Low German. In Latin, it was known as Magnopolis. The later duchy and region of Mecklenburg derives its name from the castle. The probable Slavic name, Veligrad also (“great” or “large castle”). was commemorated in a new Schloss Weligrad built between 1896 and 1898 for Duke John Albert of Mecklenburg.
The original name of the town was Veligrad, big city which was translate into german Mikelenburg large castle.
Another example that germanic people always used burg for city is Jomsborg. This was scandinavian name for Volin. They didn't call it Jomsgard…
so where ever you see gord, gard, hrad, grad, you can be sure that you are looking at a slavic settlement. scandinavians new that. this is why they called russia Garðaríki, the land of gards, slavic land south east of baltic.
what is most important about slavic gords is that they are direct continuation of the luzice culture, lusatian culture.
Similar strongholds were built during the late Bronze and early Iron Ages by the people of the Lusatian culture (ca. 1300 BC – 500 BC), and later in the 7th – 8th centuries CE in modern-day Russia, Belarus, Ukraine, Poland, Slovakia, Czech Republic and eastern Germany. These settlements were usually founded on strategic sites such as hills, riverbanks, lake islands or peninsulas.
considering that only slavs continued the tradition of building gords, we can say that slavs are continuation of the lusatian culture and that lusatian culture was slavic or if you really want to be politically correct "proto" slavic.