This is perhaps not a top level comment, so mods, do what you will with it.

What makes you think these are "unique" names? Kirsten is a pretty old name and quite common both in the U.S. and in Scandinavia. Its peak popularity was in 1994 (source: the Social Security Index of baby names, here. There's no evidence that it's more popular in the suburbs.

Vance has been popular since the 1880's and has had several upswings and downswings. Again, no evidence of it being "suburban" that I can find (if you have some, please post it!)

Cultures (including those of Anglo-Europeans) tend to follow naming rules and/or to name babies names that are in their families.

McKenna is a surname and in English naming systems, converting a last name to a first name has a very old legacy (again, not suburban, goes way back, can be found in early modern times, and has certainly been popular in the U.S. among urban, suburban and rural populations since the 1950's).

All the Jaydens/Jadens I know are black and living in the large metropolitan area where I live. However, I know that there are plenty of white Jaydens (Brittany Spears's son for example), so I'd say it can't be used as an example of a white suburban name.

Perhaps you can rephrase your question to get closer to what you are trying to ask. If you're asking whether people are looking long and hard to find unusual, not so common names for their babies, perhaps they are (but many of the same names remain popular year after year and decade after decade, in many different subpopulations).

The top name for a girl last year was Sophia (a very old name), second most popular was Emma (another old name). A google search on that name (with Sophia Vergara pictures weeded out) reveals that the name is popular among Hispanics, whites and blacks.

If, instead, you're asking how traditions of unusual (less common) names has persisted and whether it changes over time, you'd need to narrow the time focus. In the early 1900's (and late 1800's) there was a great deal of unusual naming in the US (North and South, East Coast and West). Therefore, my mom was given a very unusual name (someone's last name) and I have only been able to find a handful (5-6) other women ever who had that name (she was born in 1922). One of her sisters (born 1912) has a name that, so far, I have not been able to locate (in the Social Security database) as belong to anyone else.

My dad (born 1917) has a middle name that I can locate only in 1 other individual.

So the custom of using a last name as a first name is longterm. As an example, the name Algaut (which is quite rare) appears only in a family with the syllable Gaut- in its last name. That's an example from 618AD (source: www.ancestry.com).

The name Hawise, which appears to be rather popular in England in the 11th and 12th centuries, was once quite rare, and I can only find one woman named Hawise before 1000AD.

So names come and go (especially in English) all the time and there doesn't seem to be any pattern in which suburban white people are any more prone to "unique names." Let's recall that according to several people who study Africanisms in American culture that "unique naming" is attested to in black culture from slave times (although the names are only called "unique" because they are unfamiliar to some people; they actually follow some rules of African naming and are often not all that unique).

So, maybe give some actual "unique" examples?

Jayden Post, named in 1989, was named in Australia.

Jadon (very similar sound sequence) appears in the Bible.

Jayden hit the popularity list in the US in 1994 when a Star Trek character was given that name and it then became popular among Trekkies (urban and suburban). Jaden Smith is black; Jadin Wong (Chinese-American) was born in 1913.

So that particular name has widespread usage and popularity as well.

McKenna seems to follow the pattern of borrowing last names for first names, so MacKenzie Philips would be an example of the same kind of thing. McKenna is probably the most unusual name you listed, and is relatively rare (but still follows a well known pattern of taking last names for first names).

If you're going to use Kristen as a "unique name" do you also think "Olivia" (resurging in popularity currently) is also unique? It has never been completely unpopular (like Kristen) and has made a comeback. The only unusual name on the Social Security's Top Ten baby names is Madison (no longer unique, has been popular for at least a decade, another example of last name as first name).

Sorry for the ramble, but am hoping to help you phrase your question somewhat differently.