Hi Gregory,
Further to what Sophea and Amanda E have written above, an executor must transfer assets to their own name, or that of their trustee entity, if the assets are to be held in trust to be later distributed amongst beneficiaries. This happens when:
1. The executor applies to be a personal representative, as Sophea as mentioned, in which case, they need the legal power to deal with and administer the estate assets. In this case, the executor is a "trustee" of the whole estate for the benefit of "all the named beneficiaries and other entitled persons under the will".
2. The will entitles, or the court appoints, the executor to be a trustee for those beneficiaries who cannot immediately receive the gift allocated to them in the will. This happens when a gift is contingent upon the happening of a particular event (e.g. to my grandchild upon his marriage) or when the beneficiary is a minor and under statute, is not old enough to properly receive the gift (e.g. beneficiary under 18 years old).