You may let us know your preference using this fill. However, we will confirm if it is possible or not with confirmation email. Your prefer account name should contain your first name and/or last name (with reduction). By default, the account  name is chosen  as the first available proposal among the following, with a reduction to 8 characters when needed: 1) First letter of the first name + first letter of the middle name if present, + last name, 2) Last name + first letter of the first name, 3)First name + first letter of the last name. And a number will be added until a unique value is generated.