You can rename remote files using the RENAME command as follows:
ftp> RENAME remotefile newfile
To rename a file in other than the working directory on a UNIX-type system,
include the directory name with the newfile parameter as you
normally would on the UNIX system as follows:
ftp> RENAME remotefile directoryname/newfile
CAUTION: If the new file name you specify already exists on the remote
system, the remote system may overwrite the existing file without warning.