def get_name_from_equivalent_ids(equivalent_ids):
    """find name from equivalent id dict
    
    params
    ------
    equivalent_ids: a dictionary containing all equivalent ids of a bio-entity
    """
    if not equivalent_ids:
        return None
    if equivalent_ids.get('bts:symbol'):
        return equivalent_ids.get('bts:symbol')[0]
    elif equivalent_ids.get('bts:name'):
        return equivalent_ids.get('bts:name')[0]
    else:
        return None