The only reference to research which I found was on the site usability.gov which did some research on optimal url names for government organization. To quote the article
When the General Services Administration (GSA) changed the names of
the U.S. government's official Web portals from FirstGov.gov to
USA.gov and FirstGov en español.gov to GobiernoUSA.gov, we researched
domain name options and usable domain name characteristics. The
strategies for selecting domain names discussed in this article apply
to top-level domain names, not to all types of URLs.
Ten Characteristics of Usable Domain Names Between our research and experience at GSA, we uncovered 10 characteristics of usable
domain names that help to increase trust. The most usable domain names
- short (12 characters or less)
- easy to spell
- easy to type
- easy to say and pronounce memorable
- meaningful to customers
- meaningful to Web site partners
- meaningful in the intended language
- run together without punctuation, if compound words (e.g., GobiernoUSA.gov)
The same article also states the name can cause confusion about the objective of the site if not chosen carefully. To quote the same article
FirstGov.gov had never been a popular name for the official portal of
the U.S. government. It was redundant and awkward to say. In fact, GSA
conducted several focus groups and learned that many members of the
public thought FirstGov.gov referred to a bank or an insurance
company, despite the .gov suffix. Some government agencies were
hesitant to provide the required link on their homepages because the
name didn't mean anything to their customers. In addition, Web logs
showed that thousands of people were already typing "USA.gov" into
their browsers, guessing at what the name should be.
Lastly if your planning to be in a specific language, then your blog url should be something that makes sense in that language. To quote the same article
The name originally chosen for the Spanish-language site also had
issues; it was a hybrid-language name. "FirstGov en español" did not
describe the site from a Spanish-speaking point of view. "Español"
means "Spanish" but "FirstGov" has no meaning in the Spanish language.
In September 2006, GSA conducted an online survey of Spanish speakers
in the U.S. to test five possible names for the Spanish portal.
GobiernoUSA.gov was the clear favorite because "gobierno" means
"government" in Spanish.
Another good reference is Neilson's article on the URL as a UI