Wrong entity name?

At page http://www.w3.org/TR/REC-html40/sgml/entities.html#h-24.4 the 
entity names for quotation marks are defined:

<!ENTITY lsquo   CDATA "&#8216;" -- left single quotation mark,
                                    U+2018 ISOnum -->
<!ENTITY rsquo   CDATA "&#8217;" -- right single quotation mark,
                                    U+2019 ISOnum -->
<!ENTITY sbquo   CDATA "&#8218;" -- single low-9 quotation mark, U+201A 
NEW -->
<!ENTITY ldquo   CDATA "&#8220;" -- left double quotation mark,
                                    U+201C ISOnum -->
<!ENTITY rdquo   CDATA "&#8221;" -- right double quotation mark,
                                    U+201D ISOnum -->
<!ENTITY bdquo   CDATA "&#8222;" -- double low-9 quotation mark, U+201E 
NEW -->

I think that there is some logic in the names:

First character
    l = left
    r = right
    b = bottom

Second character
    s = single
    d = double

Third to fifth character
    quo = quotation mark

Therefore, my question is: is sbquo (single bottom) really the right 
name? Or should it be bsquo (bottom single)?

Eric-Paul Rebel