Onslowe as a Baby Name. Meaning and Origin of Onslowe

What is the meaning of the name Onslowe ?

The baby name Onslowe is a Male name , 2 syllables long and is pronounced /ˈɒn.sloʊ/ (ON-sloh).

Onslowe is English in Origin.

Onslowe is a rare variant of Onslow, an English habitational surname turned given name. It derives from Old English elements - the personal name Onna plus hlaw "mound, burial hill" - yielding the sense "Onna’s mound" or "hill of Onna." The final -e reflects medieval and early modern orthography. Related forms include Onslow (standard), Onsloe, and the less common Onslaw; feminine elaborations such as Onslowa appear sporadically in records.

Adopted as a first name in Britain and the United States during the 18th–19th centuries, it often honored the influential Onslow family, notably Arthur Onslow, long-serving Speaker of the House of Commons, whose surname also lent its name to Onslow County, North Carolina. Usage peaked in the Victorian era’s surname-as-given-name fashion and remains uncommon today, giving the name a stately, antique English tone. Pronunciation typically follows ON-sloh.

⚙ Onslowe does not appear in any of the birth registries or name datasets we track. This usually means it's either extremely rare, a regional/traditional name not captured by official statistics, or a brand-new coinage. Use it knowing your child will almost certainly be the only one in the room.