TENCHO is the nickname of Hortencio. Tencha is also from HORTENCIA. By extension it is sometimes called TENCHAS to the flowers of the hydrangea. Tencho would be a mistake
In Mexico there is no name Ortencia nor Ortencio, Hortensia and Hortensio exist and their respective diminutives are Tencha and Tencho
Tencha is a nickname, in Costa Rica to name Ortencia, for simplicity say: Tencha. But tencho, think would be named which has the name of Ortencio
Diminutive of the name "Hortensio "