const data = [
{
attributes: {
firstName: 'Ryan',
lastName: 'Karsa',
},
},
{
attributes: {
firstName: 'Carol',
lastName: 'Filippelli',
},
},
{
attributes: {
firstName: 'Ryan',
lastName: 'Hudson',
},
},
{
attributes: {
firstName: 'Ryan',
lastName: 'Lewis',
},
},
{
attributes: {
firstName: 'Sparky',
lastName: 'Malone',
},
},
{
attributes: {
firstName: 'Sparky',
lastName: 'Bond',
},
},
{
attributes: {
firstName: 'Andy',
lastName: 'Bernard',
},
},
{
attributes: {
firstName: 'Kevin',
lastName: 'Leonardo',
},
},
{
attributes: {
firstName: 'Erin',
lastName: 'Hannon',
},
},
{
attributes: {
firstName: 'Oscar',
lastName: 'Howard',
},
},
{
attributes: {
firstName: 'Erin',
lastName: 'Perkz',
},
},
{
attributes: {
firstName: 'David',
lastName: 'Wallace',
},
},
{
attributes: {
firstName: 'Karen',
lastName: 'Filippelli',
},
},
{
attributes: {
firstName: 'Omar',
lastName: 'Abbott',
},
},
{
attributes: {
firstName: 'Gabe',
lastName: 'Lewis',
},
},
{
attributes: {
firstName: 'Sparky',
lastName: 'Allam',
},
},
{
attributes: {
firstName: 'Holly',
lastName: 'Flax',
},
},
{
attributes: {
firstName: 'Jan',
lastName: 'Filippelli',
},
},
{
attributes: {
firstName: 'Jan',
lastName: 'Levinson',
},
},
{
attributes: {
firstName: 'David',
lastName: 'Levinson',
},
},
{
attributes: {
firstName: 'Ryan',
lastName: 'Howard',
},
},
{
attributes: {
firstName: 'Lindsey',
lastName: 'Perez',
},
},
{
attributes: {
firstName: 'James',
lastName: 'Bond',
},
},
{
attributes: {
firstName: 'Meredith',
lastName: 'Palmer',
},
},
{
attributes: {
firstName: 'Kevin',
lastName: 'Malone',
},
},
{
attributes: {
firstName: 'David',
lastName: 'Anne',
},
},
{
attributes: {
firstName: 'Stanley',
lastName: 'Hudson',
},
},
{
attributes: {
firstName: 'Hathaway',
lastName: 'Karen',
},
},
{
attributes: {
firstName: 'Oscar',
lastName: 'Martinez',
},
},
{
attributes: {
firstName: 'Frank',
lastName: 'Wright',
},
},
{
attributes: {
firstName: 'Charles',
lastName: 'Miner',
},
},
{
attributes: {
firstName: 'Carol',
lastName: 'Stills',
},
},
];

 let alphabetArr = data    .map(item => item.attributes.lastName)    .sort()    .map((item, index) => ({ index, name: item }));  
 data.sort((a, b) => {   return (     alphabetArr.find(item => item.name === a.attributes.lastName).index -     alphabetArr.find(item => item.name === b.attributes.lastName).inde     );  });