Notes on modifications to the racial assumptions.
The average member of any of the demi-human race lives to approximately the same age of around 100 years. Thus most elves, dwarves, gnomes, etc will not be ancient and will have a similar outlook on length of life as any human.
The new Age block for all demi-humans is the following:
Age. <race> reach adulthood in their late teens and live less than a century.
That said, in the Faerie realms time passes differently and elves, dwarves, and others from the faerie kingdoms do seem to live for longer periods of time and so for example the King and Queen of Faerie are ancient. Similarly, a recent immigrant from the Fey lands will often retain this quixotic lifespan and so an elf, dwarf, or other humanoid born in the faerie realms may live for but a few years or is just as likely to live for centuries (and the latter seems to be slighly more common). The age span for any individual seems to vary from a metaphorical gadfly where an individual will age to maturity in a few years and die of old age just as suddenly at one extreme or at the other end they will reach adult hood a little more slowly than is normal perhaps taking twice as long as you might expect and then living for centuries or longer thereafter. There have been examples of come feyborn that never seem to leave childhood (though perhaps they have and simply using magic to appear to have never left childhood behind). In any case, for those born in fey, age is a tricky thing to pin down.
That said as well, because of the rumors that the elves and dwarves and other creatures live for longer periods of time unscrupulous individuals perform all sorts of experiments and rituals on them to try to extend their own lives and witch-hunts by fearful people.
The names listed in the PH are common names in the faerie realms. Common names in the mortal realms vary by country and an elf, dwarf, gnome or other demi-human will be as likely to have any other name as a human or halfling or orc or troll.
A variety of races and ethnicities call the world their home, but the following races are the dominant races: humans, dwarves, elves, dragonborn, orcs, ogres, and beastmen (less common races that are playable also include clockwork men, gnomes, halflings, tieflings, and changlings). While most nations have a clearly dominant race and some nations are fanatical about their racial purity (due to racial wars in previous ages), most nations are a mixing post of the races where racial prejudice is less of an issue as is one of national prejudice. In this age, you are more likely to find yourself looked down upon because you come from Bretonia then because you are an Orc. Which is not to say that there isn’t racial prejudice, there is; it just isn’t as common as it was in the previous age where it was the norm. Where it is found it is strongest felt in the older more established kingdoms and it is frequently found where there are ancients involved (some of whom claim to have survived from the previous age).
As this age progresses a distinction between lower class and upper class peoples is developing and this too is becoming more of a marker and item to compare (prejudice) one against. Different races are having a tendency to fall into certain classes based on common profession that they usually take up and so there may be some assumptions based on that, but it is based on the individuals social standing and an assumption that the person of that race is likely from that social class rather than an inherent prejudice against a race. So therefore, this prejudice is in most cases quickly countered if an individual is shown to reside in a different social class. Typically elves and dragonborn are assumed to come from the upper class whereas halflings, orcs, ogres, and beastmen are assumed to come from the lower class and everyone else is middle class. Most people assume that clockwork men are servants and not free willed, even though they know that there are free willed clockwork men. Changlings are assumed to be escaped criminals (a subset of lower class) as most of them are.
Interestingly, all the humanoid races are fully compatible for child bearing. An individual is born with the appearance of his parents. If his parents are of mixed race, he will favor one (and is considered to be of that race for purposes of racial modifications) though he might show some minor traits that reflect the other parent (for example a child born of a dwarf and an elf might favor the elven mother and look like an elf, but might have the rounded ears common of dwarves or might be able to grow facial hair or the child might favor the dwarven father but might have the purple eyes of the elven mother or the pointed ears or extremely fine, elegant fingers, etc.). In the lands where racial purity is an issue, this can be problematical as the mixed heritage children are not considered “true” members of their race by the pure blooded members.