Hi! For names (given names or family names) we create an item by way of writing. So a name in Cyrillic would not be the same article than a name in Latin script. You added native label (P1705) "Третяк" to Tretiak (Q37134587) but this item is about "Tretiak" (the Latin-script name) so it was wrong. Третяк has its own item no label (Q20096996).
Family names are linked together using said to be the same as (P460) and linked to disambiguation pages using different from (P1889). Feel free to ask me any questions about this!