lvrename: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/sbin/lvrename - from package: lvm2

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/sbin/lvrename - from package: lvm2

You may install the required package with command apt-get install {package}

Error in other languages:
lvrename: bevel nie gevind nie
lvrename: comandă negăsită
lvrename: comando não encontrado
lvrename: commande introuvable
lvrename: command not found
lvrename: käsku ei ole
lvrename: không tìm thấy lệnh
lvrename: komanda nerasta
lvrename: Kommando nicht gefunden.
lvrename: kommandot finns inte
lvrename: komut yok
lvrename: nie znaleziono polecenia
lvrename: níor aimsíodh an t-ordú
lvrename: no se encontró la orden
lvrename: no s'ha trobat l'ordre
lvrename: opdracht niet gevonden
lvrename: parancs nem található
lvrename: perintah tidak ditemukan
lvrename: príkaz nenájdený
lvrename: příkaz nenalezen
lvrename: команда не найдена
lvrename: командата не е открита
lvrename: 命令找不到
lvrename: コマンドが見つかりません