Boyd’s Bible Dictionary:
Ash was not indigenous to Palestine; perhaps pine or cedar is meant (Isa. 44:14).
Concise Bible Dictionary:
The particular tree pointed out by the Hebrew word Oren is not known (Isa. 44:14). The LXX and the Vulgate call it “pine.”
Strong’s Dictionary of Hebrew Words:
Meaning:
from the same as 765 (in the sense of strength); the ash tree (from its toughness)