As a point of general principle, most courts do not strive to defeat trusts on the basis of uncertainty. In the case of In re Roberts a lady named Miss Roberts wrote in her will that she wanted to leave £8753 and 5 shillings worth of bank annuities to her brother and his children who had the surname of "Roberts-Gawen". Miss Roberts' brother had a daughter who changed her name on marriage, but her son later changed his name back to Roberts-Gawen.
Most courts do not strive to defeat trusts based on uncertainty. In the case of In re Roberts, Miss Roberts left £8753 and bank annuities worth 5 shillings to her brother and his descendants with the surname "Roberts-Gawen". Her brother's daughter changed her name upon marriage but later returned it.