As well known Old and Middle Turkic primary intervocalic velars -g- and -g- sounds dropped and creates secondary long vowels in Modern Kyrgyz. This phonetic phenomenon and unique feature makes Kyrgyz special and also separates it from the other Tukic languages. On the other hand Kyrgyz has some words that includes intervocalic velars -g-, -g- they changes -g- or -y- sounds. In this words where includes primary -g-, -g- velars could be mentioned that they do not have primary -g- and -g- sounds or this results from extremely different phonetic progress. It is controversial that some words induding intervocalic –g- and –y- have primary –g- and –g- sounds. When discussed words’ etymologies were investigated it has been seen that these differences come from several layers not exceptional phonetic progress. Not only history of Kyrgyz but also Kyrgyz language presents truely datas on this grammatical layers. In this study it is investigated that preserving intervocalic -g-, -g- sounds and chaging -y- sound in Kyrgyz then mentioned which of this archaism, which of this Historical Kypchak layer and which of this Modern Kypchak and Karluk layers.

Kyrgyz, intervocalic velars, Old and Middle Turkic, lexicology.