Dear, Marc!
You are quite correct in giving the Blomes their due "von" in the German fashion!
I just wanted to share an idiosyncracy of the little-known Scandinavian nobility. I don't know if it was because they wanted to imitate the old Danish medieval nobility, like the Rosenkrantzes, Krabbes, Geddes, Juels, Bjelkes, Gøyes, Lunges, Friises, etc. who never used a "von" (indeed it would have be ridiculous, as they usually were named after their armorial bearingss, not places) or if it was to distance themselves from the lower nobility, who often were ennobled by adding a von (e.g. Von Jenssen etc.), but the titled families themselves, like the Ahlefeldts, Bernstorffs, Wedells, Moltkes, Reventlows etc. usually dropped the "von", which they usually were entitled to, as they all were Germans. The equites originarii of Schleswig-Holstein, like the Rantzaus, Brockdorffs, Blomes etc. are often referred to without "von" in the Danish fashion, especially if they also were titled.
In Sweden, on the other hand, more titled families did sport a "von", e.g. Counts von Rosen, Counts von Essen, Barons von Blixen-Finecke etc. Perhaps this was due to more Swedish noble names being "invented armorially derived surnames" like the medieval ones above. Since the ennobled persons often were military men, they often featured miliary elements: One such was Pistolekors (meaning Pistol Cross, the arms featuring two crossed guns), which in the Germanophone Baltic Provinces became the Von Pistohlkors familiar to Romanov fans. In Sweden you have, also in the modern era, many titled families with medieval, native names and they never use a "von": E.g. the Counts Bonde, Counts Brahe, Counts Sparre, Counts Stenbock etc.
I know this sounds frightfully confusing, but I think this makes the Scandinavian nobility sound cooler than the boring, endememic Germans Von Diesburg, Von Dasberg. At least untill you get down to the Schweinheim genannt von Sackpfeife layer of the German nobility!
BTW the "von" is firmly entrenched in the Scandinavian imagination as the quintessence of (lower, ennobled) nobility, e.g. Uncle Scrooge in Donald Duck is called Joakim von And / Joakim von Anka (= von Duck) in both Danish and Swedish! :-)
