ETYMOLOGY
from oft (adv.) + -ly
EXAMPLE
“…And faste approcht: which newes when so I knew
I placed me where comming I behold
A seemely band, as eie di euer vewe,
And goodly dight as hart defier cold,
Oftlie returning vnto freends I told,
That I had seene of noblenes the flower
For discipline in ordring of a power…”
From: The True Vse of Armorie
By William Wyrley, 1592
Lexicophilia 