Translation:To give money
Yes, arian also means silver, so this sentence in the correct form could mean 'give silver'.
Other sentences with this meaning could be:-
Mi wnes i roi arian i Owen = I gave money/silver to Owen.
Dw i wedi rhoi arian i Owen = I have given money/silver to Owen.
The context would be important.
Interestingly the North Wales word for money is 'pres' which also means 'brass'.
Northern England also has the word 'brass' as a commonly used slang for money.