Where does “čerša” come from?

čerša (Proto-Slavic) comes from Vulgar Latin ceresia, from Latin ceresium, from Latin cerasium, from Ancient Greek κεράσιον, from Ancient Greek κερασός, from Akkadian ???? — pear-tree.

Ancestry of “čerša”, step by step

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

Every word from Akkadian ???? →Every word from Ancient Greek κερασός →Every word from Ancient Greek κεράσιον →