blue is sékin

sékin = blue (adjective) (color)
alternate spelling: sehkin

Some things Google found for "sékin" and "sekin":
Sekin is a unusual last name. Sékin is a rare last name. Johnson & Sekin is a Texas ad agency. In Finnish similar word sekin means "also, that too". SEKIN birch wood serving bowl from IKEA.

Word derivation for "blue" :
Hungarian = kék
Finnish = sininen (note -inen is suffix for adjective)
Samgur = sékin

yellow is kálga

kálga = yellow (adjective) (color)
alternate spelling: kahlga

Some things Google found for "kalga":
Kalga is a rare last name. Kalga is the name of a places in Russia and India. Kalga Darreh is the name of a place in Iran.

Word derivation for "yellow" :
Hungarian = sárga (which I transliterate to shárga)
Finnish = keltainen (note -inen is suffix for adjective)
Samgur = kálga

green is zidä

zidä = green (adjective) (color)
alternate spelling: zidae

Some things Google found for "zida":
Sofia Zida (aka Sofia Sida) is a Mexican-Finnish singer. Zida is an ususual feminine first name. Zida is a rare last name. User names. Zida Fashion Accessories of Minnesota. ZIDA Technologies Ltd. of Hong Kong. Zida Dingli is a place in Nigeria.

Word derivation for "green" :
Hungarian = zöld
Finnish = vihreä
Samgur = zidä