"Hello" is a relatively modern English word, gaining popularity in the 19th century as a method for grabbing attention, particularly popularised by Thomas Edison as a telephone greeting. It evolved from earlier calls like hallo and holla (used to shout to someone or call a ferryman), which have roots in Old High German and French, originally meaning to fetch or shout to attract attention. 

Etymology and Origin

• Root Origins: It is widely believed to stem from Old High German halâ, holâ, which was an emphatic imperative used to hail a ferryman (meaning "fetch," "get," or "bring").
• Influences: It is related to the Old French word holà (roughly "whoa there") and the Middle English halouen (to shout in the chase).
• Earlier Forms: Before "hello" became standardized, earlier variations like hallo, hollo, hullo, and holla were commonly used to catch someone's attention or express surprise.
• Telephone Popularity: While early uses appeared in print in the 1820s, Thomas Edison is credited with popularizing "hello" as the standard telephone greeting in the late 1870s, encouraging its use over Alexander Graham Bell's preferred "ahoy". 

Meaning and Usage

• As an Attention-Grabber: Historically, the word was used to shout at someone to make them stop or listen, akin to saying "hey!" or "yoo-hoo".
• As a Greeting: It evolved into a standard salutation used upon meeting, beginning conversations, or answering the telephone.
• As an Expression: "Hello" is also used to express surprise, or sarcastically to imply someone has missed something obvious.
• Variations: The spelling has varied over time, including hallo, hullo, holla, hillo, and halloo.