Dheghom
The word for 'earth' in Proto-Indo-European is *dʰ(é)ǵʰōm. This word is found in many different languages that come from Proto-Indo-European. For example, it is in Albanian dhe and toka, Hittite tēkan and tagān, Sanskrit kṣám, Greek khthṓn, Latin humus, Avestan zam, Tocharian tkaṃ, Old Irish dú, Lithuanian žẽmė, and Old Slavonic zemlja. This is why it is considered to be one of the most certain words we know from Proto-Indo-European.. However, there isn't much proof from language that the name *Dheghom was used for rituals. In fact, she was also known by other names, such as *Pleth₂-wih₁ (the 'Broad One'). But these other names aren't found as much in the different languages that came from Proto-Indo-European.