don’t think has been done before, so I thought it would be interesting to put a list together of when names in the England & Wales top 100 peaked in popularity! 
note: if i have made some mistakes/missed some names (which is likely because of human error) let me know
EDIT: addition of 2020s decade, based on 2020 data!
GIRLS
1900s 
ada, agnes, alice, annie, beatrice, bertha, bessie, blanche, clara, constance, dora, edith, ellen, esther, ethel, fanny, florence, gertrude, hilda, ida, jessie, lilian/lillian, louisa, mabel, martha, maud, may, mildred, millicent, minnie, miriam, nellie, rose, rosina, violet
1910s 
dorothy, elsie, kathleen, margery, nora/norah, olive, phyllis, winifred
1920s 
alma, betty, edna, eileen, freda, gwendoline, irene, joan, marjorie, monica, muriel, peggy, stella, sybil, vera
1930s 
audrey, barbara, beryl, brenda, bridget, daphne, doreen, enid, hazel, iris, jean, josephine, joyce, june, marion, marina, mavis, norma, rita, ruth, sheila, shirley, sylvia, thelma
1940s 
anita, ann, carole, carolyn, christina, cynthia, diana, glenys, gloria, jeanette, jill, judith, kay, marlene, maureen, pamela, patricia, pauline, rosemary, sandra, valerie, veronica, vivienne
1950s 
anne, annette, carol, catherine, denise, elaine, elizabeth, geraldine, gillian, glynis, hilary, janet, janice, joy, julia, lesley, linda/lynda, lynn/lynne, marian, marilyn, teresa/theresa, yvonne
1960s 
alison, angela, beverley, caroline, dawn, debbie, deborah/debra, diane, fiona, gail, jacqueline, jane/jayne, julie, karen, kim, lorraine, mandy, maria, maxine, michele, paula, sally, sharon, tina, tracey/tracy, wendy
1970s 
amanda, andrea, cheryl, clair/claire/clare, donna, joanne, kathryn, kerry, lisa, louise, marie, melanie, michelle, nichola/nicola, sara, sonia, suzanne, tanya, tara, vanessa
1980s 
anna, carla, carly, charlene, gemma/jemma, hayley, jenna, jennifer, jenny, joanna, kate, katherine, katy, kelly, kimberley, laura, leanne, lindsay/lindsey/lyndsey/lynsey, natalie, rachael/rachel, samantha, stacey, victoria
1990s 
alexandra, amy, ashleigh, beth, bethan, bethany, chantelle, charlotte, chelsea, danielle, demi, francesca, gabrielle, georgina, hannah, harriet, jade, jodie, jordan, kayleigh, kirsty, lauren, melissa, naomi, natasha, nicole, paige, rebecca/rebekah, rhiannon, shannon, sian, stephanie, yasmin
2000s 
abbie, abigail, aimee, alicia/alisha, amber, brooke, caitlin, cerys, charlie, chloe, courtney, eleanor, elise, ella, ellie, eloise, emily, erin, eve, faith, georgia, hollie/holly, isabel/isobel, katie, keira/kiera, jasmine, lara, leah, libby, lucy, lydia, madeleine, maddison/madison, megan, millie, mollie/molly, morgan, niamh, ruby, sophie, tia
2010s 
aisha, amelia, amelie, annabelle, bella, darcey/darcy, eva, evie, gracie, heidi, imogen, isabella, isabelle, lacey, layla, lexi, lilly, lola, maryam, phoebe, poppy, scarlett, sienna, summer, zara
2020s 
arabella, aria, aurora, ava, ayla, bonnie, darcie, delilah, eden, eliza, elodie, emilia, esme, evelyn, freya, hallie, harper, ivy, lily, lottie, luna, lyra, maeve, maisie, margot, matilda, maya, mia, mila/myla, olivia, orla, penelope, robyn, rosie, sofia/sophia, thea, willow
girls names that were equally as popular in 2 or more decades
christine: 1940s & 1950s
daisy: 2010s & 2020s
doris: 1900s & 1910s
emma: 1970s & 1980s
frances: 1900s & 1910s
gladys: 1900s & 1910s
grace: 2000s & 2010s
heather: 1940s & 1980s
helen: 1960s & 1970s
isla: 2010s & 2020s
jessica: 1990s & 2000s
margaret: 1920s, 1930s & 1940s
mary: 1900s & 1910s
nancy: 1910s & 1920s
sarah: 1970s & 1980s
susan: 1950s & 1960s
toni: 1980s & 1990s
zoe: 1970s & 1990s
BOYS
1900s
alfred, archibald, bertie, bertram, cecil, clarence, claude, clifford, charles, cyril, edgar, edmund, edwin, ernest, evan, francis, fred, gilbert, harold, hector, herbert, horace, hubert, hugh, lawrence, morris, percival, percy, reginald, roland, sidney/sydney, tom, victor, walter, wilfred, william
1910s
albert, alec, edward, frank, frederick, ivor, laurence, leonard, lionel, ralph
1920s
basil, denis, derrick, desmond, douglas, eric, kenneth, leslie, norman, ronald, stanley
1930s
brian/bryan, dennis, derek, donald, gerald, gordon, maurice, neville, noel, peter, raymond, roy, royston
1940s
anthony, barrie/barry, bernard, bruce, colin, geoffrey, howard, keith, malcolm, melvyn, michael, patrick, robert, robin, rodney, roger, terence
1950s
abdul, clive, gerard, graham, jeffrey, martyn, mohamed, philip/phillip, stephen, trevor
1960s 
adrian, andrew, antony, carl, garry/gary, glenn, graeme, gregory, guy, ian, jeremy, julian, kevin, martin, nigel, russell, sean/shaun, stewart, timothy, tony, vincent
1970s
brett, christian, damian, darren, dean, duncan, glen, iain, jason, justin, karl, lee, marc/mark, marcus, nicholas, paul, richard, scott, shane, simon, stuart, wayne
1980s 
christopher, craig, damien, danny, gareth, gavin, jonathan, leigh, mathew, ricky, ross, terry
1990s 
aaron, adam, alexander, ashley, bradley, conor, dale, dominic, elliot, jake, jamie, joe, jordan, josh, kieran, liam, luke, matthew, mitchell, nathan, ryan, sam, thomas
2000s
aidan, alex, bailey, ben, benjamin, billy, brandon, callum, cameron, declan, dylan, ellis, ethan, finlay, harvey, jack, jay, joel, joseph, joshua, kai, kyle, leon, lewis, louis, mohammed, morgan, owen, reece/rhys, samuel, taylor, tyler
2010s
alfie, austin, blake, charlie, dexter, elliott, harley, harrison, harry, ibrahim, jacob, jayden, jenson, joey, kian, logan, mason, max, mohammad, ollie, riley, sebastian, seth, toby, zachary
2020s
albie, archie, arlo, arthur, bobby, caleb, carter, chester, elijah, ezra, felix, finley, finn, frankie, freddie, gabriel, george, grayson, henry, hudson, hugo, hunter, isaac, jackson/jaxon, jasper, jesse, jude, leo, louie, luca, lucas, milo, muhammad, myles, noah, oakley, oscar, otis, reggie, reuben, roman, ronnie, rory, rowan, sonny, teddy, theo, theodore, tommy, yusuf
boys names that were equally as popular in 2 or more decades
alan/allan: 1940s & 1950s
arnold: 1900s & 1910s
connor: 1990s & 2000s
daniel: 1980s & 1990s
david: 1950s & 1960s
ivan: 1930s & 1940s
james: 1980s & 1990s
john: 1910s to 1950s
neil: 1960s & 1970s
oliver: 2010s & 2020s
steven: 1960s, 1970s & 1980s
which decade’s names do you like the most? 
my favourite is the 1910s - i feel as though the names popular back then have a dark academia sort of vibe!
could you find your own name, and was it most popular in the decade you were born in? mine certainly was! 
not surprised it rated highly in 2000/10s