Ruth is also French and Estonian (used alongside Rutt in Estonia). The name day for Ruth in France is October 2. The name day for Ruth in Estonia is January 4. [noted -ed]
In 2018, 85 is the most common age for an American (U.S.) Ruth who is registered female with the Social Security Administration. It is the 117th most common female first name for living U.S. citizens.
Ruth has been on the top 1000 list since the 1880's. Its most popular year was 1900 to 1910 where it ranked 5. In 1890 and 1920 it ranked 6. Its popularity began to slide in 1950. The name Ruthann appeared on the top 1000 list in 1930 and 1940 where it ranked 878 and 518.
https://www.behindthename.com/name/ruth-1/top/brazil
https://forebears.io/forenames/ruth