haitch

Etymology
From earlier with an initial H (lost already in Vulgar Latin) restored, from, from , from , probably an extension of earlier , from an unidentified source. The restoration reflects the pronunciation of the letter name in several dialects of English. See the Wikipedia article about the letter.

Usage notes
Is often considered to be h-adding and deemed nonstandard in England, but occurs in Hiberno-English and Australian English as the standard dialect. It is also seen in scattered varieties of Edinburgh, England, and Welsh English, especially among the younger people.