Tarnovsky (Тарновський in Ukr) is an old nobility name, dating back
to Kyevan Rus. There is also a prominent Cossack line with this
surname. Today Tarnovsky can be found across Ukraine.
I found telephone listings for it in Lviv and Kyiv, etc.
The following is an article covering some famous Tarnovsky. It would be worthwhile for you to have it translated from Ukrainian into Spanish.
Today many Tarnovsky are prominent in political, cultural and
educational circles.
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I am having a problem with surname Kalechac????
The closest I have found is Калечиць, and it is not a common surname.
Can anyone in your family provide us w/surname, as written using Cyrillic?
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When did your family immigrate to Chile?