general otto french strahl memorial

On the sign it says Otho and on this website it says Otto. Which is it ? I was just wondering which is the correct name.

Confederate Gen. Otto French Strahl was born in Ohio, but called Dyersburg home at the time the Civil War began. Here he helped recruit soldiers for the Confederate Army. On Nov. 30, 1864, Strahl died at the battle of Franklin, Tenn., leading his troops in action. Today Strahl's grave in Dyersburg is marked with a monument containing a cannon barrel from the Confederate garrison of Fort Pillow, located about 50 miles south. A Tennessee historical marker about Strahl is at the edge of the historic old Dyersburg City Cemetery, on East Court Street (Tennessee Highway 104), just east of downtown. There is no admission fee.The memorial is simple, well maintained and appropriate.