Sibling names for William

If you’ve chosen William (a boy name of Germanic origin), these names pair well as a sibling. Matched by shared heritage, similar U.S. popularity tier, and a different first letter and ending to avoid confusion at roll call.

Sister names for William

Emma

Girl · Germanic

Whole, universal

Charlotte

Girl · French

Free woman; feminine of Charles

Life; bird; possibly from Germanic 'avi'

Ella

#32

Girl · Germanic

All, completely; a light fairy maiden

Girl · Germanic languages

From Adeline, a diminutive form of Adela and Adele brought to England by the Normans

Caroline

#83

Girl · French

Free woman; feminine form of Charles

Adelaide

#284

Girl · Germanic languages

Borrowed from Adélaïde, from Adalheid (from t=noble + t=nature, character), modern;

Heidi

#352

Girl · Germanic languages

From Swiss Heidi, a pet form of Adelheid, equivalent of English Adelaide and Alice

Astrid

#399

Girl · Germanic languages

Borrowed from modern Scandinavian (-, -, -) Astrid since the 19th century

Matilda

#438

Girl · Germanic languages

From Matilda, from Mathilde, from Mahthilt, Mehthilt, from Mahtihild, from Mahtihildiz; compare, t=Matilda

Brother names for William

Henry

Boy · Germanic

Ruler of the home; estate ruler

Boy · Germanic languages

Taken into regular use in the 1990s, with earlier popularity peaks in Scandinavia and Germany

Axel

#71

Boy · Germanic languages

In quiet use since the 19th century

Robert

#89

Boy · Germanic

Bright fame; from 'hrod' (fame) and 'beraht' (bright)

Richard

#221

Boy · Germanic languages

From Rycharde, from Richard, from Richardus and Ricohardus, from Rīkahard, from Rīkaharduz, a construction Cognate with t=Richard

Otto

#282

Boy · Germanic languages

from -, short form of compound names beginning with aud, from audaz (cognate of in Edgar, Edmund, Edward, Edith, etc

Raymond

#360

Boy · Germanic languages

A number of places elsewhere

Hugo

#415

Boy · Germanic languages

A Latinized form of Hugh

Frank

#469

Boy · Germanic languages

From Frank, partially from Franca; and partially from Franc, and/or Francus, from Franko; both maybe from frankô

Jeffrey

#485

Boy · Germanic languages

The usual U

How we pick siblings

For each candidate we require: the same primary origin as William, a U.S. rank in 2023, a different first letter, and a different two-letter ending. Candidates are then scored by origin overlap and proximity in rank, so siblings sit in the same popularity tier rather than pairing a Top-10 name with something obscure.