My understanding is that Max & Gittel settled soon after immigration in Duluth MN where he established a business that began with scrap metal and which became the Duluth Iron and Metal Company. Gittel's father was a rabbi and, according to family history, was married four times, with only the last wife's name known, and that was Frieda Mary, who remarried after Rabbi Lass died. Gittel's known siblings (some of them presumably half-siblings) were Louis Lass, Leah Lass Dick, Eva, Rose, Esther, and Sam. I've been exchanging information with Eva Wilk's daughter and will have to ask her if she knows about a Blumenfeld connection.
I wouldn't be concerned with the Laas spelling. Spellings tended to be phonetic and anything goes. It's not like these names started out in the English language.
Incidentally, Duluth is in St. Louis County. Could the county have been confused with the city?