Where does “Justinianic” come from?

Justinianic (English) comes from English Justinian, from Latin Iustinianus, from Latin Iustīnus, from Latin iūstus, from Latin iūs, from Latin dīcō, from Latin -tiō, from Latin dissertātiō — small stone, pebble; gravel, rubble.

Ancestry of “Justinianic”, step by step

Justinianic traces back through two separate lines of ancestry.

via English Justinian

Step	Language	Word	Meaning
1	English	Justinian	A family name in Late Antiquity, notably that of Justinian I, emperor of the Byzantine Empire from 527 to 565
2	Latin	Iustinianus	Justinian
3	Latin	Iustīnus	Justin
4	Latin	iūstus	just, righteous
5	Latin	iūs	law, right
6	Latin	dīcō	to say, talk, speak, utter, mention
7	Latin	-tiō	tion, -ation, -ing
8	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
9	Latin	dissertus	arranged, disposed; explained
10	Latin	disserere	second-person singular future passive indicative...
11	Latin	dis-	asunder, apart, in two; reversal, removal;...
12	Latin	calceus	shoe
13	Latin	calx	limestone; chalk; the finish line
14	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

via English ic

Step	Language	Word	Meaning
1	English	ic	related or pertaining to; having the character of

Every word from Ancient Greek χάλιξ →Every word from Latin -tiō →Every word from Latin dis- →