Wiktionary is usually good with words like this: https://en.wiktionary.org/wiki/Reconstruction:Proto-Germanic/ahw%C5%8D#Descendants https://en.wiktionary.org/wi

Wiktionary is usually good with words like this: https://en.wiktionary.org/wiki/Reconstruction:Proto-Germanic/ahw%C5%8D#Descendants https://en.wiktionary.org/wiki/Reconstruction:Proto-Germanic... And it thinks "a" is an archaic Dutch word meaning stream: https://en.wiktionary.org/wiki/a#Dutch https://en.wiktionary.org/wiki/a#Dutch