The surname "Yatsko" is pronounced /jætsˈkoʊ/ and is spelled with the letter "Y" which represents the sound /j/. The following letter "a" is phonetically pronounced with the sound /æ/ and the letter "t" represents the sound /t/. The second letter "s" represents the sound /s/ and the final letter "ko" is pronounced as /koʊ/. In summary, the name "Yatsko" is spelled using a combination of sounds and letters in the International Phonetic Alphabet (IPA), which represents the pronunciation of words in various languages.