No, it isn't. Bloomfield is of medieval English origin. Jews of the surname Bloomfield mostly once were Blumfelds who "Americanized" their name.
I’m only going by what my Jewish husband said about his name.
Jewish refugees into Britain did the same thing in order to fit in. Having a German sounding name during WWI caused a lot of Germans, Jewish or not, to anglicise their names to avoid getting beaten up or burned out of their homes.