'pro-dynasty' originates from modern English as a compound of the prefix 'pro-' and the noun 'dynasty'; 'pro-' originates from Latin 'pro' where it meant 'for', and 'dynasty' ultimately comes from Greek 'dunast(ē)ia'/'dunastēs' meaning 'ruler'.

'pro-' is Latin in origin ('pro') and combined with 'dynasty', which entered English via Old French/Latin (Old French 'dynastie', Latin 'dynastĭa') ultimately from Greek 'dunasteia'; the specific hyphenated compound 'pro-dynasty' is a straightforward modern English formation (20th–21st century) built from these elements.

Initially the roots conveyed the sense of 'for' (pro-) and 'ruler' (from Greek); over time the compound came to mean specifically 'in favor of dynastic rule or a particular ruling family' in modern usage.