Dagda - a god called the Good God. Daghda.

Daibh�id - (DEH-vid or da-VEECH)(H) "beloved". Daighi, David, Daibhead (same pronun.)

Daigh - (DEHV or DAVE?) "flame or fire".

Daimine - (day-min?) derived from word dam "deer" or "ox". Daimhin, Damon.

D�ire - (DEH-ruh, DI-re or DAHR-uh) Old Irish word meaning "oak grove", "fruitful" or "fertile", and most likely the name of an early fertility or bull god; the Brown Bull of Cooley was owned by Daire mac Fiachna, and his refusal to loan his bull to Queen Medb was part of the reason for the fight between the Ulsterman and the men of Ireland. Dary, Darragh.

D�ith� - (DAH-hee) "swiftness, nimbleness". Dahy.

Daley - (day-lee) possibly "advisor", "an assembly" or "a valley". Dawley, Dale, Daly.

Dallas - (Gael) "wise". Dall.

Damhlaic - (DAW-lik)(L) "like the Lord". Dominic, Doiminic (DOH-min-ic).

Daniel - (H) "beloved".

Daray - (Gael) "dark"; version of French-Norman name D'aray. D'aray, Dar, Darce.

Darby - (dar-bee) (Gael) "free man".

Darren - (Gael) "great". Daron, Darrin, Darrion.

Dearg - "son of the Dagda".

Declan - (DEK-lawn) Name of a 6th C. saint who founded the monastery Ardmore in County Waterford. D�ahgl�n (DEK-lan).

Delaney - "descendant of the challenger".

Delano - (deh-LAH-no)(Gael) "dark" or "a healthy black man".

Demne - when Fionn was tutored by Finneces, he took this name.

Dempsey - (DEM-se) "proud".

Dermot - "free man" or "free from envy". Dermod, Darby, Darcy.

Derry - (Gael) "red-headed"; "great lover", "an ancient hero". Also a city in Northern Ireland.

Desmond - (DEZ-mond) "man of the world"; from a surname based on an old name for the territory of South Munster. Demond.

Desmumhnach - "man of Muman" which was a tribe or territory in the Cork area of Munster before the Anglo-Norman invasion.

Devin - (Celt) "a poet". Dev, Devon.

Devine - "ox". Daimhin.

Devlin - (Gael) "brave or fierce". Devlyn.

Devnet - "poet".

Diancecht - (DI-an-ket) the great physician of the Tuatha De Danann; father of Miach, Cian, Cethe, and Cu, daughter Airmid. Dian Cecht.

Diarmaid - (DEER-mit) "free man"; legendary member of the warrior band of Finn mac Cumaill. He had a beauty mark on his forehead that made any woman who saw it to fall madly in love with him. Diarmait, Diarmuid, Dermot, Dermod.

Digby - "a town with a ditch or dike".

Dillon - (Gael) "faithul" or "faithful".

Dinsmore - possibly means "fortified hill".

Doherty - "harmful".

Dolan - from a word meaning "dark-haired". Dolin, Dolyn.

Dominic - (L) "like the Lord". Damhlaic.

Domnall - (DON-al) "world-mighty"; popular in ancient Ireland. Donal, Domhnall.

Don - "brown stranger"; form of Donald; Irish lord of the Underworld or Land of the Dead.

Donahue - (Gael) "dark hued" or "dark warrior"; related to Don, the Irish god.

D�nal - (DON-al or DOH-nal) from domun "world" + gal "ardor" or "valor"; "world-mighty". Popular since the earliest times. Domnall was the name of five high kings including Domall Ilchelgach (Donal of the Many Treacheries), ancestor of the O'Neills and MacLoughlins. Domhnall, Domnall, Donall, Donald.

Donald - (Celt) "world ruler, brown stranger". Donal, Doughal, Don.

Donn - (DON or DOWN) from Old Irish donn, meaning both "brown" and "chief". Mythological god of the dead, who lived on an island off the of Munster. Popular until the end of the 19th C., esp. with the Maguires and Kennedys. Donnagan, Donnan (DUN-ahn).

Donnan - (DUN-ahn) "brown".

Donnchadh - (DUN-uh-khuh) "brown lord"; "strong warrior"; from Old Irish name Donnchad: donn "brown" or "chief" + cath "battle". Name of the son of Brian Boru, King Donnchadh Donn (d. 1064). Traditional in O'Brien family. Donaghy, Donogh, Donagh (DOH-na).

Donnell - related to Donal and Domnall; Doneal, Donnelly.

Donnelly - "brave, dark man, a brave black man".

Donovan - "dark or brown warrior". Donvan.

Dooley - "dark hero".

Doran - "stranger" or "exile". Deoradhain.

Dougal - (DOO-gahl) "dwells by the dark stream" or "dark stranger, from the dark water". Dubhghall (DOO-gal, or DOO-ahl), Dubgall, Douglas, Douglass, Duglas.

Dow - "dark-haired. Dubg.

Doyle - (Celt) "dark stranger". Doy.

Driscol - "interpreter". Driscoll.

Drummond - (Celt) "unclear".

Duane - (Celt) "song". Dewain, Dwayne.

Dubaltach - "black-jointed" or "dark-limbed". Dubhaltach, Dualtach.

Dubgall - (DOO-ahl) "dark or black foreigner"; refers to the Vikings, esp. from Denmark, who came to Dublin in 850. Dubghall.

Dubh�n - (DUH-ven, or DUH-wen) "dark, black". Dowan, Duggan, Duane, Dwayne, Dubhagain.

Dubhdara - (doov-DAW-ra) from Old Irish dub "dark" + dara "oak" = "dark man of the oak".

Dubhghlas - from dubh "black" + glas "blue". More popular in Scotland than Ireland. Douglas.

Duer - (Celt) "heroic".

Duff - (Celt) "dark-faced; black-faced".

Dugan - variants Dubhan, Duggan.

Dunham - (Celt) "dark man; black man".

Dwayne - derived from "dark"; or "from the dunes". Duwain, Duane.