My Sister's Name is "Seven"

My sister's name is "Seven"
and my brother's name is "Eight."
My parents gave them freaky names
I'm sure they thought were great.
They could have named him "Michael"
and they could have named her "Sue."
Instead they both decided1 that
no normal names would do.
My brother could be "Brandon."
Maybe "Benjamin" or "Bill."
They could have named him "William"
and then simply called him "Will."
My sister could be "Sarah."
Maybe "Kimberly" or "Kelsey."
They could have named her "Caroline"
or "Katherine" or "Chelsea."
My brother could be "Steven"
or they could have named him "Todd."
But instead, his name is even
and my sister's name is odd.