Elsdon \e-ls-don, el-sdon\ as a boy's name is of Old English origin, and the meaning of Elsdon is "Elli's valley". Transferred use of the surname, originally a local name from Northumbria. The place name was used in the 13th century in the forms Eledene, Hellesden, Elisden, and Ellesden. Elli was an Old English personal name based on Elias.

Baby names that sound like Elsdon are Alsdon and Elston. Other similar baby names are Eldon and Elson.