It is narrated from Sayyiduna Samurah bin Jundub (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Never name your slave Yasar, Rabah, Najih or Aflah, for you will say: 'Is he there?' and he will not be, so it will be said: 'No.' These are only four names, so do not add to them."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6763