EY

This letter combination represents the sound /eɪ/. It typically comes at the end of nouns:

E.g.
prey
they -> þey

It's also used in gerunds from -eie verbs:

E.g.
conveying -> conveying
obeying -> obeying
preying -> preying
sleying -> sleying
purveying -> pôveying
surveying -> sôveying