I thought they were called zonkeys
I thought it depended on which species is father, rather like Ligers & Tiglons for Lion/Tiger cross breads or Mules & Hinnys for Donkey/Horse mixes.
But Wikipedia suggests the male provides the first part of the name (though it lists both Zedonk & Zonkey. Colchester zoo definitely called theirs Zedonks, the last of which died in 2009.
Colchester Zoo definitely called theirs Zedonks, their last one died in 2009.
Colchester Zoo definitely called theirs Zedonks, their last one died in 2009.