The word Holwe may appear to have an unusual spelling, but it's actually phonetically correct. Using the International Phonetic Alphabet (IPA), we can see that the "h" is pronounced as a glottal fricative (h sound), followed by an "oh" diphthong pronounced as /oʊ/ (like the "o" sound in "boat"), and ending with a voiced "w" sound, pronounced as /w/. Therefore, the correct pronunciation of Holwe would be something like "HOH-loh-wuh". Remember, just because a word's spelling looks different doesn't always mean it's incorrect or misspelled!
Hollow.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.