Click on the country you are travelling in:
SNCB - Benerail
Thalys - Eurostar - InterCity
Tickets are nominative and in the case of a misspelling or a wrong name, it is not possible to change the name on the ticket. If the ticket fare allows you to do so, you may cancel your ticket and issue a new one, with the correct name.
TGV - TER - Intercités - TGV Lyria
It is not possible to amend the name on the ticket, and therefore the only option is to cancel the ticket (if the fare allows you to) and issue a new one.
ICE and IC (InterCity)
IC and Freccia - Regional train - Thello
Unfortunately, a change of passenger names is not permitted.
Tickets are not nominative and there is no identification necessary in order to use the tickets for Renfe.