Ya

This and the next several words are numbers in various Celtic and Slavic languages:

da--OI and Scots Gael. 'two'

tra--similar to most Celtic and Germanic words for 'three'

gathery--Irish ceathair (and various Slavic reflexes, e.g. Rus. chetyri) 'four'
 
pimp--Welsh (pump) and Breton (pemp) 'five'

shesses--Welsh and Breton chewch, Rus. shest' 'six'