Where does “リア” come from?

リア (Japanese) comes from Japanese リアル, from English real, from Middle English real, from Old French reel, from Latin reālis, from Latin rēs, from Latin vindicatio, from Latin vindicō — small stone, pebble; gravel, rubble.

リア (Japanese): rear; the back or hindmost part

Definitions

rear; the back or hindmost part

Ancestry of “リア”, step by step

リア traces back through two separate lines of ancestry.

via Japanese リアル

Step	Language	Word	Meaning
1	Japanese	リアル	real
2	English	real	True, genuine, not merely nominal or apparent;...
3	Middle English	real	real, true, factual; concerning possessions;...
4	Old French	reel	—
5	Latin	reālis	real
6	Latin	rēs	thing, object, stuff
7	Latin	vindicatio	civil lawsuit; protection, defence; vindication;...
8	Latin	vindicō	to lay claim to as one's own (often with sibi)
9	Latin	vindex	claimant, vindicator
10	Latin	dīcō	to say, talk, speak, utter, mention
11	Latin	-tiō	tion, -ation, -ing
12	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
13	Latin	dissertus	arranged, disposed; explained
14	Latin	disserere	second-person singular future passive indicative...
15	Latin	dis-	asunder, apart, in two; reversal, removal;...
16	Latin	calceus	shoe
17	Latin	calx	limestone; chalk; the finish line
18	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

via English rear

Step	Language	Word	Meaning
1	English	rear	To bring up to maturity, as offspring; to...
2	Middle English	reren	To raise; to hold or pull up or suspend upwards;...
3	Old English	rǣran	to cause to rise, raise, rear, build, create; to...
4	Proto-Germanic	raizijaną	to cause to rise; raise
5	Proto-Germanic	rīsaną	to scale; move vertically; to rise
6	Proto-Indo-European	h₁rey-	to arise, arise; to rise, arise; to rise; arise

Every word from Ancient Greek χάλιξ →