zostar = blackbird (bird) (noun) (some things Google found for "zostar": an uncommon term; user names; name of several gaming characters; a misspelling of zoster, as in varicella zoster virus (VZV), which is the cause of chicken pox in children and shingles in adults)
Word derivation for "blackbird" :
Basque = zozo, Finnish = mustarastas (literally: black thrush)
Miresua = zostar
Like the English word blackbird, the Finnish word is also a compound word containing the word for black. The Basque word is short, and isn't close to the word Basque word for black, but it interestingly can also translate as stupid or foolish.