The Clan system of Scotland is much more complex than you might think.  If you have family from Scotland in your genealogy perhaps you have come up against this dilemma of highland versus lowland families with the same  name.  Here is a great explanation found on the Clan Fraser site:

“There is confusion because the term ‘clan’ can also be used to describe a lowland family, despite them not having any Gaelic history nor living under the clan system. This is explained well by Wikipedia in their The Lowland Families section. Furthermore, not until the 19th century did the Lowland families identify themselves by specific tartans, or wear the kilt or play the Great Highland Pipes.”

“The Clan’s current chief is Simon Fraser, the 18th Lord Lovat, and 25th Chief of the Clan” as cited on Wikipedia. Lady Saltoun’s web site accurately explains this saying “The Frasers of Philorth, Lords Saltoun, being the senior line, are Chiefs of the name of Fraser, although a lowland family. Lord Lovat is Chief of the very numerous Highland Clan Fraser of Lovat, based in Inverness-shire.”