Ma'am is pronounced Mam (as in spam) rather than Marm (as in palm[!])
• Interesting pronunciations include:

Althorp - All-trup
De la Warr - Della-ware
Beaulieu - Bew-ly
Le Fanu - Leff-new
Blenheim - Blen-im
St John - Sin-jun
Cholmondeley - Chum-li
Theobald - Tibbald

And y'all accuse US'ns of spelling funny. Harrumph!®