There's no way to beat some of the animals already listed, but I think Pudu puda deserves a mention, as well as Nycticorax nycticorax nycticorax - especially since their common name in Dutch is simply "kwak".
Came along a scientific name which has a complete differtent meaning in Dutch : the spider-genus Kut.... :
Kut gen. nov., a new troglomorphic spider genus from Turkey (Araneae, Dysderidae)
Has anyone mentioned the Great evening bat Ia io?
Nowadays, it is at danger of extinction, mostly because of collectors of Hitler memorabilia, who desperately want to have one of these guys.
"Naming the Shrew" is a good book dedicated to the subject. Informative and joyful.
https://www.amazon.co.uk/Naming-Shrew-Curious-History-Latin/dp/1408865556
Was gonna say the Boops, Boops boops, but it's already been mentioned.