The spelling of the word "Roed" may seem a bit unusual, but it is actually quite logical when considering its pronunciation. Using the International Phonetic Alphabet (IPA), the correct pronunciation of "Roed" can be transcribed as /rəʊd/. The first two letters, "Ro", indicate a long "o" sound, while the "e" at the end creates the "d" sound. This follows the common pattern of English words ending in "-ed" where the final "e" is silent and merely serves to indicate the past tense.
Filled or impregnated with roe.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.