Celtiberian boustom 'cowshed, byre'

Celtiberian boustom 'cowshed, byre', attested in the Botorrita I text, is a compound from Celtic *bow- 'cow' < IE *gʷōw- and *-sto- 'standing' < IE *sth₂-o-¹, formally identical to Old Irish búas 'riches, wealth (in kine)'². In Iberian toponymy, this word has descendants in busto, bustar 'meadow': Busto, Bustelo/Bustillo, Busdongo, Bustarviejo, etc³.

I think possible for Iberian buiśtin-, boiśtin-, attested in La Serreta texts, to be a Celtiberian loanword with reduction of unstressed vowels o/u > i.

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¹ C. Jordán Cólera (2004): Celtibérico, p. 64.

² R. Matasović (2009): Etymological Dictionary of Proto-Celtic, p. 71.

³ J.J. Moralejo (2007): Callaica nomina. Estudios de onomástica galega, p. 42.