Cyd is a given name, and may refer to:
In fiction:
Cymdeithas y Dysgwyr, better known as CYD, is a movement that offers social opportunity to bring Welsh learners and speakers together so that Welsh learners can improve their oral skills in the language and get a deeper understanding of Welsh culture.
This can happen
One of its founders and current honorary president is Professor Bobi Jones, a renowned Welsh scholar.