Where does “偽アカシア” come from?

偽アカシア (Japanese) comes from Japanese アカシア, from Latin acacia, from Ancient Greek ἀκακία, from Ancient Greek ἀκή, from Proto-Indo-European h₂eḱ- — sharp.

Ancestry of “偽アカシア”, step by step

偽アカシア traces back through two separate lines of ancestry.

via Japanese アカシア

Step	Language	Word	Meaning
1	Japanese	アカシア	acacia
2	Latin	acacia	the gum arabic tree; the juice or gum of this...
3	Ancient Greek	ἀκακία	An acacia tree; innocence
4	Ancient Greek	ἀκή	point; silence; healing
5	Proto-Indo-European	h₂eḱ-	sharp

via Japanese 偽

Step	Language	Word	Meaning
1	Japanese	偽	a falsehood, lie; a false statement
2	Middle Chinese	ぎ	—

Every word from Proto-Indo-European h₂eḱ- →Every word from Ancient Greek ἀκή →Every word from Ancient Greek ἀκακία →