I (husband) moved out of USA for work and supported myself and my wife for 5 months before she joined me abroad. The home my wife living, we jointly own but the loan is only in my name.
In addition to a foreign housing income, can I also claim my US residence as a primary residence for 6 months as my wife lived there whom I supported?
You are in luck. You are allowed to deduct mortgage interest on your main home or second home. However, if you are trying to take the foreign earned income or housing exclusion then your tax home must be abroad. And you must meet either the physical presence test or the bona fide residence test. Maintaining a home in the United States would more than likely make you ineligible for this exclusion from your income.