Iranic words in European languages.

[Alpakut]

Maybe the name "Szekelys(Sekey)" have some conection to the name "Sakae"

This is true. We Kazakhs have also a tribe called Säk.

[Alpakut]

Now as comparison Turkish

Turkish	English
beyaz (loanword)	white
karra(Arabic loan)	black/dark
mavi (arabic loanword)	blue
kirmizi (arabic loanword)	red
sari	yellow

Turkish	English
ak (native Turkic)	white
kara (native Turkic)	black/dark
gök (native Turkic)	blue
al (native Turkic)	red
sari (native Turkic; but shares similarities to East Iranian)	yellow

See for example kara (>black<) which is not of Arabic origin.
Proto-Turkic: kara >black<

Descendants

• West Oghuz:
  
  • Azeri: qara
  • Gagauz: kara
  • Turkish: kara
  
  
• East Oghuz
  
  • Turkmen: gara
  
  
• West Kipchak
  
  • Crimean Tatar: qara
  • Karachay-Balkar: къара (qara)
  • Kumyk: къара (qara)
  
  
• North Kipchak:
  
  • Bashkir: кара (qara)
  • Tatar: кара (qara)
  
  
• South Kipchak
  
  • Khazak: қара (qara)
  • Kyrgyz: кара (kara)
  • Nogai: кара (qara)
  
  
• Karluk:
  
  • West:
    
    • Uzbek: qora
    
    
  • East:
    
    • Old Turkic: kara
    • Uyghur: قارا (qara)
  
  
• Siberian:
  
  • North Siberian
    
    • Dolgan: кара
    • Yakut: xара (xara)
    
    
  • South Siberian
    
    • Yenisei Turkic
      
      • Shor: қара (qara)
      
      
    • Altai:
  
  
• Southern Altai: кара (qara)
  
  • Oghur:
    
    • Chuvash: хура (hura)

It might be a hybridization of Iranic and Turkic ( as we know many Words in Turkic are hybridizations of Iranic and Altaic words). Maybe Kur is Iranic for hil/mountain while Gan Altaic for Grave?

Or gan/an might come from typical ending for Iranic terms.

Kur can have different meaning in Turkic, it can mean hill, mountain, fortress and it can mean protection. -gan is just a suffix (with a soft -ĝ-). I don't think it can be applied to Iranism.