| Name | Meaning | Origins | Gender | Popularity (last 10y) | |
|---|---|---|---|---|---|
| Cystennin | Constant, steadfast | Welsh | Boy | — | |
| Daffydd | Beloved | Welsh | Boy | — | |
| Dafidd | Welsh form of David meaning "beloved" | Welsh | Boy | — | |
| Dafyd | Beloved | Welsh | Boy | — | |
| Dafydd | Beloved | Welsh | Boy | — | |
| Dafydd ap Gwilym | David, son of William - 'beloved' (David) son of the 'resolute protector' (William) | Welsh | Boy | — | |
| Daie | Beloved | Welsh | Boy | — | |
| Dalwyn | Fair or blessed valley (combination of 'dal' = valley and Welsh '-wyn' = fair/blessed) | Welsh | Boy | — | |
| Dav | Beloved | Welsh | Boy | — | |
| Davydd | From Hebrew David, meaning "beloved" | Welsh | Boy | — | |
| Dawe | Beloved (from Hebrew name David) | English, Welsh | Boy | — | |
| Dawfydd | Beloved | Welsh | Boy | — | |
| Deiniol | God is my judge | Welsh | Boy | — | |
| Delfyn | Dolphin | Welsh | Unisex | — | |
| Delwyn | From Welsh 'del' (pretty) + '-wyn' (white/fair/blessed) - 'pretty and fair' | Welsh | Boy | — | |
| Delwynn | From Welsh elements 'del' (pretty) and 'gwyn' (fair/blessed) - 'pretty/fair, blessed'. | Welsh | Boy | — | |
| Delys | Genuine, sincere, true | Welsh | Girl | — | |
| Delyth | Pretty, beloved | Welsh | Girl | — | |
| Delytha | Pretty, beautiful | Welsh | Girl | — | |
| Delythia | Likely 'pretty' or 'beautiful' (derived from Welsh Delyth) | Welsh | Girl | — | |
| Delythya | From Welsh Delyth - 'pretty', 'beautiful' or 'fair'. | Welsh | Girl | — | |
| Deri | From the oak grove; associated with oaks | Welsh | Unisex | — | |
| Derryna | Possibly a feminine elaboration - from Irish Darren/Daire (oak, fruitful) or Welsh Deryn (bird); generally interpreted as a feminine form meaning 'oak' or 'bird'. | English, Irish, Welsh | Girl | — | |
| Dervyn | Probably a variant of Derwin/Darwin meaning "deer friend" (Old English deor 'deer' + wine 'friend'); alternatively may derive from Irish Ó Dearbháin ('descendant of Dearbhán') | Welsh | Boy | — | |
| Derwen | Oak (oak tree) | Welsh | Unisex | — | |
| Devaughne | Little, small, younger | English, Welsh | Boy | — | |
| Devydd | Beloved | Welsh | Boy | — | |
| Dewi | Welsh: form of David meaning "beloved"; Indonesian/Sanskrit: "goddess". | Indonesian, Welsh | Boy | — | |
| Dewi Sant | Welsh form of David meaning "beloved"; specifically refers to Saint David, the patron saint of Wales. | Welsh | Boy | — | |
| Dewie | Beloved (diminutive of David) | English, Welsh | Boy | — | |
| Dewy | Beloved (from David); also evokes 'dew' (moisture) | Welsh | Boy | — | |
| Dewyt | Beloved | Breton, Welsh | Boy | — | |
| Difyr | Fun; amusing; entertaining | Welsh | Unisex | — | |
| Dilann | Born of the sea; son of the ocean | Welsh | Unisex | — | |
| Dillis | Genuine, true, faithful, steadfast | Welsh | Girl | — | |
| Dillwyn | Surname-derived name; likely contains Welsh element 'wyn' ('white/fair' or 'blessed'), overall meaning uncertain and primarily denotes family/place origin | Welsh | Boy | — | |
| Dilwyn | Likely from Welsh elements 'dil' (possibly 'devoted' or 'beloved') + 'gwyn' ('white, fair, blessed'), roughly 'beloved/fair' or 'blessed beloved'. | Welsh | Boy | — | |
| Dilys | Genuine; faithful; steadfast | Welsh | Girl | — | |
| Dilysa | Genuine; true; sincere; steadfast | Welsh | Girl | — | |
| Dinas | 'city' or 'fortress' (from Welsh dinas) | Welsh | Unisex | — | |
| Dinmore | Great fort | English, Welsh | Boy | — | |
| Drudwas | Beloved servant; precious lad | Welsh | Boy | — | |
| Drudwyn | Precious and fair ('dear/precious' + 'fair/blessed') | Welsh | Boy | — | |
| Drych | Mirror; reflection | Welsh | Unisex | — | |
| Dubric | Derived from the Welsh name Dyfrig (Latinized as Dubricius) and associated with a 6th-century Welsh saint; the exact original meaning is uncertain. | Welsh | Boy | — | |
| Dy | A short form or nickname with meanings that depend on origin: from Welsh Dai/David 'beloved', from Dylan 'son of the sea', or from Vietnamese Duy 'only/sole'. | English, Vietnamese, Welsh | Unisex | — | |
| Dyfed | Named for the historic kingdom/region of Dyfed in southwest Wales (territory of the Demetae). | Welsh | Boy | — | |
| Dyl | Sea-born; 'son of the sea' | Welsh | Boy | — | |
| Dylan-Jorge | Combines Dylan ('sea‑born' or 'son of the sea') and Jorge ('farmer' or 'earth‑worker') | Welsh | Boy | — | |
| Dylana | Feminine form of Dylan, meaning "born of the sea" or "child of the sea" | Welsh | Girl | — |
Aggregated births across United States, United Kingdom, France, Germany for every Welsh-origin name in our dataset.
