Species will typically have names... sales are aimed at orchid collectors. Hybrids from an orchid vendor often are named. But the ones that you get from places like grocery or big box stores often are sold without names, they're just pretty.
For those with names - if the grower wants people to know about the parentage of the plant they can register a name with the Royal Horticultural Society (RHS), which is the international registry. (Costs a modest fee for each cross) So of course, the ones that get named are typically a little higher-end. In the mass market, there are a lot of no-name plants (NOID is the term you will see a lot) or they may be given a name that isn't registered... a "trade name". If you have a named hybrid, and want to learn more about it, you can look it up on
Orchidroots, a terrific free website. (You can also look it up on the RHS Registry website, but it's a lot less forgiving)
As you get more into the hobby, the "pedigree" or species names very likely will become more important to you as you seek to learn about your plants. But those NOID Phalaenopsis (and other types) are very lovely - buy what you like, and enjoy it! Within a given type (like Phalaenopsis) the culture of the named ones and the unnamed ones is, by and large, the same. For care, check out this "sticky" thread
The Phal abuse ends here. - Orchid Board - Most Complete Orchid Forum on the web ! - lots of good information.