Where does “ceresium” come from?

ceresium (Classical Latin) comes from Latin cerasium, from Ancient Greek κεράσιον, from Ancient Greek κερασός, from Akkadian ???? — pear-tree.

Ancestry of “ceresium”, step by step

Step	Language	Word	Meaning
1	Latin	cerasium	cherry, fruit of the cherry tree
2	Ancient Greek	κεράσιον	cherry; cherry tree
3	Ancient Greek	κερασός	bird cherry, "Prunus avium"
4	Akkadian	????	pear-tree