Where does “drzewik” come from?

drzewik (Polish) comes from Polish drzewo, from Proto-Slavic dervo, from English doru, from Ancient Greek δόρυ, from Proto-Hellenic dóru, from Proto-Indo-European dóru, from Proto-Indo-European drew- — hard, firm, strong, solid; hard, fast; tree.

drzewik (Polish): tree vole

Definitions

tree vole

Ancestry of “drzewik”, step by step

Step	Language	Word	Meaning
1	Polish	drzewo	tree
2	Proto-Slavic	dervo	tree
3	English	doru	Alternative form of dory
4	Ancient Greek	δόρυ	wood, tree, stem; spear shaft, spear, lance,...
5	Proto-Hellenic	dóru	tree
6	Proto-Indo-European	dóru	tree
7	Proto-Indo-European	drew-	hard, firm, strong, solid; hard, fast; tree

Every word from Proto-Indo-European drew- →Every word from Proto-Indo-European dóru →Every word from Proto-Hellenic dóru →