Deryck Cooke
Deryck Cooke( 14 September 1919 – 26 October 1976) was a British musician, musicologist, broadcaster and Gustav Mahler expert.
Galin Dimov
Galin Dimov( born 29 October 1990) is a Bulgarian footballer who currently plays as a midfielder for Neftochimic Burgas.
His twin brother Plamen is also footballer.
They are sons of Diyan Petkov.
Deryck Cooke
Deryck Cooke( 14 September 1919 – 26 October 1976) was a British musician, musicologist, broadcaster and Gustav Mahler expert.
Melhania dehnhardtii
Melhania dehnhardtii is a plant in the family Malvaceae.
It is named for the German explorers Clemens and Gustav Denhardt.
Gustav Leubner
Gustav Leubner is a Sudeten German bobsledder who competed for Czechoslovakia in the mid-1930s.
He finished 12th in the four- man event and 17th in the two- man event at the 1936 Winter Olympics in Garmisch- Partenkirchen.
Galin Dimov
Galin Dimov( born 29 October 1990) is a Bulgarian footballer who currently plays as a midfielder for Neftochimic Burgas.
His twin brother Plamen is also footballer.
They are sons of Diyan Petkov.
Diyan Petkov
Diyan Petkov Dimov( born 4 August 1967) is a former Bulgarian footballer and currently manager of Neftochimic Burgas.
The Treasure Planet
The Treasure Planet( Bulgarian:" Планетата на съкровищат а Planetata na sakrovishtata") is a 1982 Bulgarian animated science fiction film directed by Rumen Petkov and produced by Boyana Film.
The 62 minute movie is a science fiction adaptation of Robert Louis Stevenson's adventure novel.
Plamen Dimov
Plamen Dimov( born 29 October 1990) is a Bulgarian football defender who plays for Kazakhstan Premier League club Okzhetpes.
His twin brother Galin is also footballer.
They are sons of Diyan Petkov.
Plamen Dimov
Plamen Dimov( born 29 October 1990) is a Bulgarian football defender who plays for Kazakhstan Premier League club Okzhetpes.
His twin brother Galin is also footballer.
They are sons of Diyan Petkov.

Question: Did Diyan Petkov and Gustav Leubner have the same nationality?
Answer: no