Legally, as per Singapore Airlines name change policy, as long as you have the proper documentation, you'll be OK. Because the name on your ticket and your I.D. must match on the day of travel. If your name has been altered recently and the name on the ID and the ticket do not match, passengers need to carry valid documentation to request the name on the ticket. You would be asked to pay the non-refundable flight change fee. The tickets would be sent to issuance in a similar or higher class of service, subject to availability. Fare differences may apply.