Leandro,
I, too, wondered if there is a connection between the Pilans in your country and the Pilans from mine, but I have never been able to find any information to support this.
I even asked a cousin who is from Romania if she has heard of any connections, but she said she hadn't.
How long has your family lived in Brazil? Do you have any Romanian relatives?
You may want to look up addresses at
http://www.whitepages.ro/ . This is a Romanian listing of phone numbers and addresses. I was able to find my cousin by writing to several of the Pilans on the list. Maybe you will have luck there too!