You can identify yourself with only your first name on a personal cell phone or home voice mail. If it is a business voicemail, I suggest including your first and last name. I would also include your title.
This video on English Voicemail Greeting Sample covers the key areas of English pronunciation such as double / diphthong vowels, long vowels, word stress and word endings and more.

5.( جميع موظفينا لا زالوا يقدمون المساعدة لعملاء آخرين. يرجى ترك رسالة أو إرسال بريد إلكتروني إلينا - سنقوم بالاتصال بكم في أقرب وقت ممكن. شكرا جزيلا لاتصالكم بنا - إلى اللقاء.
The transcribed text is expected to be approximately 85% accurate, which means eight (8) words out of every ten (10) should be translated correctly. Since the voice mail transcription is done by an automated program, accuracy depends on several factors, including the caller’s accent and noise levels during the message recording. Names and nouns may not translate accurately. To ensure the receipt of a message, a copy of the .wav file “audio” is sent along with the text transcription. English and Spanish. Other languages will result in an error message, but voice mail will be attached in the email notification. In the email version, you will see ellipses (three periods) after the last successfully translated word if the next word or words cannot be translated successfully. You may also see question marks next to words that the transcription did not understand. To ensure receipt of a message, a copy of the .wav file “audio” will be sent along with the text transcription. How do I know who called if the system incorrectly transcribes the caller’s name? You can still listen to the audio version attached to the email message, or just listen to voice mail over the phone. If I delete the email containing the audio file, will that delete the voice mail on my phone?