Is it possible to obtain extract on change of name at Diia?

Yes, it is. 

For that you need to register or log in to a citizen’s account at Diia portal and select the «Extract on change of name» service.

Further, click the button «Submit application». After that, fill in the online form and select the way that is most convenient for you (by post or at the nearest civil registry office). 

Also, you need to pay for the service. The fee is approximately UAH 73. 

The status of the application could be checked in citizen’s account at section — Services — Ordered services. Also, the should be the notification via email.