Hi, That's really very nice to know that you are soon expecting twins.
Am also a very strong devotee of Lord Murugan. You can probably include 'Sharan' (short form of Saravanan) & Guhan -- for boy babies. Will soon check and add similar names for girl babies..
Just wanted to add -- i was blessed with a boy baby early this year by Lord Murugan & it was a great feeling when i came to know that my son was born under the star 'Karthigai' which is His nakshatram

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We never know how we will be blessed by Him for our faith & devotion.