House of Names is a surname product peddler. It is an example of what the second poster was making reference. Actually if you will read everything they have they state.
"We encourage you to study the Silveria family history to find out if you descend from someone who bore a particular family crest . . . . . . . . No families, not even royal houses, can make sound claim to the right to bear arms unless a proven connection is established through attested genealogy records."
Frequently more than one man with the same surname, not all necessarily related, were each granted or assumed their own coat of arms, all different. No one peddler will have all of them. They don't need to in order to sell to suckers. House of Names will have more than one coat of arms associated with the same surname if more than one man with the same surname from different national orgins were granted one. Then they will have one of each and there might have been 25 or more. Most men with that same surname are not entitled to a coat of arms at all as they have no direct male line ancestor that was ever granted or assumed one.
Actually there is no such thing at all as a Family Crest. A crest is part of a coat of arms. Coats of arms DO NOT belong to surnames and actually, except maybe in Poland or France, they don't belong to families. They were assumed by or granted to individual men and are inherited by individual men.
If this is a school project, please print off what I have posted here and give to your teacher.
Not too long ago there was an ad running on TV for a company selling framed surname histories which is rather shady as not everyone with the same surname has the same family history. When surnames were taken or assigned in Europe during the last millennium it wasn't impossible for legitimate sons of the same man to wind up with a different surname and still each could have shared his surname with others with no known relationship. Therefore the root person of your surname will not necessarily be the root person of someone else with your surname. The man in the ad stated "a" coat of arms will be on it, not "your" coat of arms. You see on TV the FCC can slap a company hard for fraudulent advertising. The FCC has no control over the internet, or some scam merchant in your local shopping mall, or at an airport, or someone advertising in magazines or my mail.
When you go into someone's home and you see one of those walnut plaques with a coat of arms on it on their den wall or over their fireplace, it is okay to smile to yourself. However, they very likely really believes it belongs to them and it would not be polite to laugh or make some deprecating remark about it in their own homes.