This paper offers an approach to Indo-European dendronymy. The research on this field of study, neglected in recent years, is the main goal as well as the updating and reviewing certain etymons contained in Mallory-Adams's Dictionary (1997). The more recent documentation and the growth of knowledge in Indo-European languages that back in time were poorly attested, like Celtiberian language, will let us review and update the etymons and offer new cognates for it.