Shackenzie
The perpetual bonding, hanging out, attention-giving, loving, smooching, cuddling, schmoopying, caring, questioning, answering, reminding, responding, suggesting, attending, hand-holding, canoodling and ogling between two people named Mackenzie and Sherry. This is similar in form to Brangelina, Bennifer and other couples-turned-individuals.
They spent so much time together and were so inseparable, they became a Shackenzie.