Every pedal except the sostenuto pedal also has an English name. Sostenuto means "sustained" in Italian, according to Wikipedia.
Another reason for an English word to replace the word "sostenuto" is that it has 4 syllables while the other pedal names have fewer (the soft pedal has 1, the damper pedal has 2)
Every other pedal has an English name. What's another name for the sostenuto? (Please make sure the name is in English.)