Luan (Red or White is typical) and Meranti (name used interchangeably) are actually tropical "cedars" (with almost 100 sub-species falling into that named group) that grow in the Philippines amongst other places in S.E. Asia which is probably why they (collectively) are called Philippine Mahogany.
There is also an African Mahogany, the street name (mostly) for Khaya or Okoume/Gabbon (so named for the country of origin) that is also NOT a "true mahogany".
There is also a couple of (other) South American "mahoganies" that have made their way into the boat building market in the past 10 years or so that, while they are hardwoods, are not "true mahogany" either.
Genuine or "true" mahogany is still available but it mostly of the "farmed" variety (mostly from Honduras, and controlled under one of the CITIES agreements for endangered plants/animals) but doesn't have the same density etc as the "real stuff" from years gone by.