table certificate
cert_ky bigint primaryKey

table NAME
NME_KY bigint primarykey,
nme_rlt_tbl_nm varchar,
nme_rlt_ky bigint,
NME_LST_NM varchar,
NME_GVN_NM varchar

@Entity
@Table(name="CERTIFICATE")
class Certificate {
        @Id
   @GeneratedValue
   @Column(name = "crt_ky")
   private Long certKey;

   @OneToOne(cascade = CascadeType.ALL)
   @JoinColumn(name = "crt_ky", referencedColumnName = "NME_RLT_KY")
   private Name name;
        .......
}

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "NME_RLT_TBL_NM", discriminatorType = DiscriminatorType.STRING)
@DiscriminatorValue("certificate")
@Table(name = "NAME")
public class Name implements Serializable {

   private static final long serialVersionUID = -1060132506269104470L;

   @Id
   @GeneratedValue
   @Column(name = "NME_KY")
   private Long nameKey;
   @Column(name = "NME_GVN_NM", length = 50)
   private String givenName;
   @Column(name = "NME_LST_NM", length = 50)
   private String lastName;

   @OneToOne
   @JoinColumn(name = "NME_RLT_KY", referencedColumnName = "crt_ky", insertable = false, updatable = false)
   private Certificate certificate;
    .......
}

select name from Certificate

select
  name1_.NME_KY as NME2_120_,
  name1_.NME_RLT_KY as NME5_120_,
  name1_.NME_GVN_NM as NME3_120_,
  name1_.NME_LST_NM as NME4_120_
from
  CERTIFICATE certificat0_
inner join
  NAME name1_
   on certificat0_.crt_ky=name1_.NME_KY

@OneToOne(cascade = CascadeType.ALL, mappedBy="certificate")
   private Name name;