Index Match formula using range name

I guess what you want to do is make 3 names for each table

MyTable
table

TableValueA
=offset(mytable,0,0,1,columns(Mytable))

TableValueB
=offset(MyTable,0,0,rows(Mytable),1)

then you can do

Index(Mytable,match(ValueB,TablevalueB,0),match(valueA,tablevalueA,0))

If your table changes just change MyTable to reference the new table limits!