Where does “trześnia” come from?

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

trześnia (Old Polish): sweet cherry, Prunus avium

Definitions

sweet cherry, Prunus avium

Ancestry of “trześnia”, step by step

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

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