Cumbrian Sheep Counting Numerals

In the English Lake District there exist alternative sets of numerals
which are used to count sheep. Each valley has its own version and I
give two examples below:

Borrowdale Eskdale
---------- -------
1 yan yaena
2 tyan taena
3 tethera teddera
4 methera meddera
5 pimp pimp
6 sethera hofa
7 lethera lofa
8 hovera seckera
9 dovera leckera
10 dik dik
20 jigot gigot

The existence of these numerals is usually ascribed to the survival
of remnant Celtic populations following the arrival of the Angles and
Norse settlers, and the words for 5 and 10 seem to confirm this,
however I have difficulty explaining the other numerals. Are they
just fanciful inventions?
Interestingly if this is the survival of a Celtic remnant then it is
most unusual because the local dialects were heavily influenced by
Old Norse, which for a few centuries, upto the 11th century I think,
was the common language of the area.
What is even more fascinating perhaps is that a similar set of
numerals has been identified in Cincinnati in the United States; a
children's counting game as follows; een, teen, tother, feather, fib,
soter, oter, poter, debber, dik. The only explanation I can think of
is that there must have been migration from this part of England to
Cincinati.
Can anyone throw some light on these matters and is anyone aware of
any other alternative/remnant counting systems?
Thank you in advance.
David James.