From Proto-Germanic *hwaz (“who, what”). Cognate with Old English hwā, Old Frisian hwā, Old Saxon hwē, Old Dutch wē, Old High German wēr, Gothic 𐍈𐌰𐍃 (ƕas). Merged with Old Norse hverr from Proto-Germanic *hwarjaz (“which, what”).
*hver (defective, neuter hvat)
An archaic and defective pronoun conflated with hverr (< *hwarjaz) in Old West Norse. The masculine nominative should be *hver, i.e. *hvęʀ, in Old West Norse, with -a- > -e- (-ę-) due to ʀ-mutation, but it is uncertainly attested due to the prevalence of abbreviations for pronouns in manuscripts. This form, nearly identical to hverr and likely completely identical when unstressed, may account for the conflation of these two originally distinct words seen in Old West Norse. The Old East Norse form should be *hvar, without the mutation. This pronoun has survived better in East Norse descendants and been kept distinct from hverr. No feminine forms are attested and probably did not exist in the Old Norse period.