Where does “spade fork” come from?

spade fork (English) comes from English spade, from Italian spade, from Italian spata, from Latin spatha, from Ancient Greek σπάθη, from Proto-Indo-European sph₂-dʰ-.

Ancestry of “spade fork”, step by step

spade fork traces back through two separate lines of ancestry.

via English spade

Step	Language	Word	Meaning
1	English	spade	A garden tool with a handle and a flat blade for...
2	Italian	spade	plural of spada
3	Italian	spata	spathe
4	Latin	spatha	spatula, spattle; spatha; a long, two-edged,...
5	Ancient Greek	σπάθη	any broad blade, of wood or metal
6	Proto-Indo-European	sph₂-dʰ-	—

via English fork

Step	Language	Word	Meaning
1	English	fork	A pronged tool having a long straight handle,...
2	Middle English	forke	A fork or graip; A fork-shaped fire iron; A...
3	Old English	force	(found in compounds)
4	Proto-West Germanic	furkō	fork
5	Latin	furca	A two-pronged fork, pitchfork; A fork-shaped...

Every word from Proto-Indo-European sph₂-dʰ- →Every word from Ancient Greek σπάθη →Every word from Latin spatha →