I remarried after my wife's passing... How can I take her name off from our house deed and add my new wife's name?

This transfer must be done through the estate of your wife. Hire counsel and this can be accomplished

If you held the title as husband and wife then title automatically passed to you on her death. You would then be able to have an attorney prepare a new deed from you as surviving tenant by the entirety to you and your new spouse. If title was held any other way at the time of her death then you would need the executor or administrator of the estate to change the deed to your name alone after which you could then change the deed to you and your new spouse. Consult a real estate attorney to review the title and prepare the new deed and transfer documents

If you were married to your wife at the time of her death and title was not held specifically as tenants in common, title automatically passes "as a matter of law" to you upon her death. Consult with an attorney to make sure there are no other outstanding issues. It should be a simple matter to draft a deed with the allied documents and add your new wife to the deed.

As the other attorneys previously stated, you should contact a real estate attorney in your area who will be able to review the last deed of record and advise you accordingly.