I'd start at https://behindthename.com/name/Richard - it has all the international variants. You could always use it as a middle or look at names with similar meanings - it means brave ruler so you could search that and get Alaric, Aldric, Bernard, Edric, Eric, Roderick, even Henry. A few of these also share the -ric sound so that could connect it further (Frederick, Theodoric, Derick, Garrick, etc)
Here are names that mean ruler or king like Richard does: Friedrich Leroy Alaric Aldrich
I actually work with a Richard Junior & he goes by RJ
Hardy Rickon Richart Ritchie Rhisiart - Welsh Reichardt/Reichard - German Rickard/Rikard - Swedish Ricardo - Spanish/Portuguese Rikhard - Finnish Rihard - Slovene Hudson - son of Richard Dickson/Dixon - son of Richard Richmond Ricco/Rico Rick/Rik Richter Richie Chard Ricky Chad Rich Riku - Finnish Dix Arden Ryker Rurich Aldrich Jericho Alberich Theodorich Eldrich/Edrich Kendrich/Kenrich Deidrich Rodrich Ulrich the name Richard means "strong ruler/brave king", so a name like Kingsley or Kingston could also work! other names with a similar meaning to Richard: Rex - king Rian - king Reagan - little king Alarico - noble ruler Frederick/Friedrich - peaceful ruler Heinrich - home ruler Delray - of the king Leroy/Leroi - king Darius - kingly Basil - like a king Malik - king Rory - red king Emyr - king Raj - king đź‘‘đź’™
R.J. lol
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Richie , Ricky , Rico are nicknames of Richard that you could use as a first