Seems to me that it means only biblical names are ok. am i understanding this correctly?
Many animal names that are used for boys are not the names of people in Tanach. Ari/Aryeh, Tzvi and Dov, AFAIK are not names of people at all in Tanach, while Z’ev is the name of a Cannanite king. Nonetheless, all four are used quite extensively.
And, if you will argue, that they are okay simply because the word appears in Tanach, then I counter that “Gamal,” “Kelev,” “Chazir” and “Z’vuv” are also acceptable names.
The Wolf