Looking at the Handbook, I don't see any policy regarding updating contact information. It does stress the importance of accurate records as far as ordnance and official actions, but seems to be quiet about contact information.
As far as names, Section 33.6.2 "A person’s full legal name, as defined by local law or custom, should be used in membership records and on ordinance certificates." However, the "preferred name" is more flexible.
If you have questions I'd ask the bishop if he approves the changes as he has responsibility over the records of his ward, and the gift of discernment. He may be aware of some situations you're not.
This would also be a good question to talk to the stake clerk about as he is responsible for your training.
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