adding on to demue's post, KF definitely doesnt allow this. According to their T&C, "Pooling of KrisFlyer miles and/or status credits is not permitted and each KrisFlyer membership can only be utilised by one person. For the avoidance of doubt, the conversion and/or accrual of KrisFlyer miles into a KrisFlyer account from credit/charge points not belonging to that KrisFlyer member is strictly prohibited.Singapore Airlines reserves the right to cancel a KrisFlyer account and all KrisFlyer miles and/or status credits in the account for any breach of this clause."

we can already find people getting caught from an very old thread (Verification for name mismatched - FlyerTalk Forums), but post no 7 seems to suggest the correct way to go about doing it. i must stress that this is a very old thread and i dont know the accuracy of the information within.