Violet appeared on the top 1000 list in the 1880's until the 1960's. It came back on the top 1000 list in 2003. Its most popular year was 1910 where it ranked 79.
Like Veronica it seems to have been used (albeit sparingly and among certain upper-class families) in Scotland from the sixteenth century, long before it became general in England, possibly due to the Auld Alliance between Scotland and France and the influence of French names. (Violette in its case).