No, malarkey is English. The German translation is:
Quatsch
Blödsinn
Nonsens
It is an American-English word, with unknown origins.
It's actually an Irish surname: it has a variety of spellings.
Mullarkey, Mullarky, Malarkey etc.
Irish
Meallacach (pron. m'alekok), Gaelige language, adj., alluring, charming, beguiling, deceitful. Emerged into English language from Irish immigration to the East coast of the US. See 'How the Irish Invented Slang' by Daniel Cassidy for further details.
During election time, the debates usually consisted of political malarkey and promises they couldn't keep
Gary Malarkey was born in 1953.
Bill Malarkey died in 1960.
Donald Malarkey was born on July 31, 1921.
Donald Malarkey was born on July 31, 1921.
John Malarkey died on 1949-10-29.
John Malarkey was born on 1872-05-04.
Bill Malarkey was born on 1878-11-26.
Daniel J. Malarkey House was created in 1909.
The phrase full of malarkey means that one is full of foolishness and nonsense